Radiator fluid or coolant helps keep your car engine running well. If you’re using a chemical that isn’t designed to be used as an automotive flush (like CLR), that’s a bad idea. Drained it and then filled with warm water and rad flush. Make sure that your car is off and the engine is cool because the coolant can be extremely hot and can scald you. Disconnect both hoses from the radiator. No coolant leak from the head gasket. The Mighty Fumoto Valve: Oil Changes Made Easy [Review], Ultimate Car Wash Kit Review And Buying Guide For 2020. The 10 Best Engine Cleaner Products Out This Year! And a T-stat. And this is a sincere question/comment for your situation: did all the crud get removed from the inside of the hoses? could the green antifreeze be causing all this junk in the cooling system? This process, along with running distilled water through the radiator before adding fresh antifreeze, is collectively called "flushing" the radiator. From recent experience of about 2 years, I had a mysterious and extremely slow intermittent coolant leak in an older car. If the gunk radiator flush doesn`t work would it hurt to put CLR in the radiator and run the engine for 5 minutes or so? - posted in VX220 Discussion: As per title, I have just flushed my coolant and refilled it with 'Speed Flush' but haven't emptied it yet. The flush has corrosive properties that will actually get all of the old antifreeze, rust, and scale cleared out. Here is what a mechanic will do during a radiator flush: Leave the engine to cool: Your engine must be cool to perform a radiator flush. And on the thermostat. Run the engine for about 10 minutes with the heater on high after it reaches operating temperature. You should flush your radiator at least once a year. After that I stopped using anything that plain water for the flush & drain, then filling up with a 50/50 mix. Follow the directions on the flush because there are a lot of different options on the market and each one has slightly different directions. The Zerex radiator flush will drain all of it out within five minutes. Good for you. You can flush a radiator with tap water, but it won’t be as effective as using a flush. Long story short, I used a bottle of Stop Leak and some "safe for all vehicles" coolant as a bandaid for a leaking radiator. I really think the current fix is temporary. Some of the flushes take longer than others. When incompatable coolants are mixed [not flushing out the system completely], they can react forming a gel IF left in years without changing. The basic process is to put in the flush, turn on the engine to circulate the fluid, let the car cool, and then drain the flush. Replacing a few gaskets is much easier & less $$ than replacing the main engine bearings. Serious crud comes from contamination and/or corrosion in the system, and both are signs of bigger problems on the way. The time required for a radiator flush depends on the type of flush you use and the time it takes for your car’s engine to cool down completely. The radiators were heating up fine but just thought they were a bit small for the size of the room. I took off all the down stairs radiators and blasted them with a real powerful jet wash yesterday to clean any dirt out but they were not bad. You need to get it out asap. It could have been the water pump and could have been something more major. It prevents building up debris and rust that can clog the radiator. I’ve used a commercial brand radiator flush product (as I recall it was made by Prestone) on my truck, and it seemed to work ok. I’d never put CLR into my truck’s cooling system tho, no telling what it would do to the gaskets. How Long Should the Flush be Left in the Radiator? Both products state not to use it in systems made of aluminum or copper. Refill and drain several times to make sure it is all out of the cooling system before putting the final mix in. You can accidentally breathe it in or it spreads to the skin and it causes chemical burns. The heater blew hot air for about 3 or 4 minutes than stopped. It helps keep your car in top-notch condition. I was planning on removing the t-stat and running a bottle of the Prestone flush stuff. Hot air likes to rise so if the radiator is dissipating heat … This will contaminate fresh new Prestone Command® HD Antifreeze/Coolant added the cooling system. I’ve got a 2000 VW Polo. However, it … Usually, it takes anywhere from 30 to 60 minutes to flush a radiator. Moreover, some signs or symptoms will show that your car needs a radiator flush. I had to remove the water pump and clean out some debris that clogged in there. All rights reserved. As well as a new heater core. Just regarding the heater core inlet and outlet pipes alone, scraping the crud off the pipes’ insides doesn’t clear the crud off the core’s tubes… and if there’s that much crud in the heater core, I’ll bet there’s crud in the radiator too. However, having a few items on hand will make the process go even smoother. A radiator flush is actually a normal maintenance item. Question: does this mean I need to drive the car around or is it sufficient to let it idle? They both are effective and can clean your radiator, but they both pose different problems. Sentinel X400 High Performance Cleaner restores a more even heat distribution to the house, keeping the property warmer and bills lower. Hope this helps. If there is any kind of warranty still in effect, I’d use Dexcool. I flushed it a 3rd time using CLR,then plain water it worked for about 10 minutes than blew cold again. The coolant in your radiator is a 50/50 mixture of commercial coolant and water, and together this solution makes a liquid that helps cool your engine by circulating through the cooling system. Radiator coolant, sometimes called antifreeze, is the green, yellow, or orangish liquid that fills your car's radiator. You may need to turn on the car again to circulate the fluid. It is safe to use with aluminum, iron, plastic and brass radiators. How long can radiator flush be left in? One problem I had after using the product I used, I soon begin hearing a rattling souind coming from the water pump. Do this several times until the fluid that you see in your drain pan is as clear as water. The most common one is an overheating engine. I remember that I use to buy Prestone radiator flush. Gotta be careful that bits don’t move to smaller blood vessels (like in the brain) and clog them. Maybe even a new radiator and radiator hoses. Suggest not to use a flush agent unless you know for sure you need to. After running the corrosive chemical flush (which I did before the other needed repairs on the cooling system) to flush out all the rust and scale, and flushing several times with fresh water, I replaced all the parts that were needed to be repaired (i.e. Make sure to follow the instructions on the flush's bottle to determine how long to let it sit, while paying attention to the car's temperature and making sure it does not overheat. I will soon flush the radiator and put in new coolant. Irregular smells, like a hot maple-syrup-like smell or the smell of antifreeze, can also indicate you need to take a look at your radiator. Powder flushes are powerful but have more risks associated with their use. Haley is a writer, reader, and life long learner. Idling is just fine. How long can a radiator flush be left in a radiator? Not more than five minutes, that’s the ideal time you should leave the flush in your radiator. It is better to install a new one in this case. Don’t use CLR or Lime Away in an automotive cooling system. There are a couple of different types of flushes. I have reverse flushed heater cores sometimes to get them to work better. It is the final step. But sometimes antifreeze can build up as old coolant, rust, and scale deposits. After adding the flush solution, the instructions say I need to run the engine for at least 10 minutes before flushing the system several times with clean water. Power Stroke Selected as Best Diesel over Cummins and Durama... Be Prepared: 10 Car Essentials For Winter [Buying Guide], The Advantages of Buying Car Parts Online, Copyright © 2021 Autowise. Allow the engine to cool down, then drain the radiator again, refill the system with water and repeat the process. The first step is to locate the coolant reservoir cap and unscrew it as this will help the radiator drain more easily. Remove both hoses, turn the heat control flow valve to full on, and figure out a way to connect a garden hose to the outlet side of the core, turn on the faucet, and water and gunk will come out the inlet side. On theres it said you could leave it in there for a few hours (6 driving hours). Also known as the Bucket Flush, the 36 Hour Flush or the 3 Day Flush, (yes I know that there are more than 36 hours in 3 days...) this type of flush is very useful for electrolysis removal, oil emulsification, aluminum oxide removal, rust removal, and … I`m going to flush it with water again tomorrow and put antifreeze in it and test it again but I think I found the problem and fixed it. If it was my vehicle, I’d use the green stuff simply because it is cheaper and I would plan to drain and refill it more often than some people would recommend. You should never need to flush the system if you drain and refill often enough. wouldnt this take more time to get through the system? Then sudden faster leak confirmed to be the water pump shaft seal. If it's soap based a day or so but anything caustic or acidic should only be ran few minutes to no more than an hour at best and then flushed with clean water and the refill appropriately. Flushing your radiator is a fairly easy process that doesn’t require a long list of supplies. If you’re still experiencing problems with your cooling system, you can try to do a second flush or take it into a professional. Once the old coolant is drained, pour in your choice of radiator flush. Get it out now and hope you’ve lived a righteous life so whatever deity you worship (if you worship a deity) blesses you with luck. Ran it until it got to temperature and then ran for another 15 minutes. Perhaps VW will recommend a particular flush agent they know is compatible. In her free time, you can find her reading the latest book, discovering new hobbies, or running in the desert. The heater didn`t work so I flushed the heater core with just plain water. Experts recommend draining and replacing the antifreeze in your radiator every five years or 100,000 miles, whichever comes first. You can buy flushing kits too at your auto parts store that let you flush your system via the water pressure coming out your garden hose, with the engine off. Check by catching some water in a glass jar and looking for sediment which you can see only in still water. The two most common are powder and liquid. If corrosion and scale build-up in your system, it can clog the radiator’s tiny passages, the water pump, the engine’s water jackets and even the heater core. @tardrex, do us a favor will you, if you blow out any rubber hoses (radiator/heater) over the next couple of months, let us know. I flushed it again with water and it worked for about 5 minutes then stopped again. running radiator flush through them is alright for a while but leaving it in there is kind of hard on the seals ,and yes i have seen it damage the seals in … In order to make sure you have all the chemical flush out of there, I would purchase a flush-and-fill kit from an auto parts store, the kind that allows you to hook up a garden hose and run it to force water out the open end of the radiator, but considering how many times you’ve flushed it already, that might be overkill. Keep an eye on the coolant level and the coolant temp gauge as those leak plugging agents can sometimes work for a while, then start failing. I left engine flush in for a week, motor was spotless in the water channels and jackets - pity about my 3 core radiator :-(. But many auto service shops will recommend a coolant flushing process instead. After 4 to 6 years or after driving 40,000 to 60,000 mi (64,000 to 97,000 km), it’s recommended that you change the coolant in your radiator to keep your engine running well. Congrats on your success. The flush is used to clean out plugged heater cores and also removes coolants in a single flush. A Lola Digital Media Company. …should i use the dex cool or keep using the green stuff that was in there? Refit the radiator pressure cap and turn the water on full. 01. of 05. How long does a radiator flush take? BTW, it’s impossible to get all the flush product out on the first drain. In the end I didn’t flush the radiator but added one can of water pump lubricant and one can of radiator leak plugger to the new coolant. Be sure to check with your local authorities on how and where to safely dispose of old fluid. When the mixture of boiling water and sodium hydroxide melt through the radiator core, that would be too long. Lastly, any grinding or knocking engine noises or steam coming from under the hood could also indicate a problem with your radiator. Then allow the solution for 10 minutes so that it can work to flush through the pipes of the radiator. The process is fairly universal, but some things can vary so, again, be sure to read the directions. Pour the radiator flush product into the radiator. Next place your pan under the radiator drain to catch the dirty fluid. The stuff eats away at rubber. Lol I did mine once, I ran the engine for about 5 minutes first. A warranty is likely not an issue with this car, so you should only use Dexcool if you plan to leave it in there a long time. Some of the flushes take longer than others. It’s a little like breaking up clogged arteries in people. Usually, it takes anywhere from 30 to 60 minutes to flush a radiator. Push the end of a garden hose into the top radiator connection stub, and seal it with rags. In a 12 gallons system that equals up to 3 to 4 gallons of contaminated coolant or flush water left in the system. Lasted about a year or so with no leaks. The coolant service usually involves draining the old coolant and putting new coolant in. Changing the coolant requires draining the existing fluids and flushing the system before you add a new antifreeze solution. Glad you are back on the road w/a continent vehicle. Powder flushes have more inherent health risks. Close the caps and run the engine for ten minutes or so with the heater on full blast. It does a throughout cleaning of the radiator’s inside properly. Flushing your radiator is an important part of regular car maintenance. It said to leave it in for 15 minutes and then drain and flush the radiator with water. You can repeat the process if necessary. As time goes on, your car's radiator builds solid deposits that can clog the cooling system. You can use dexcool, the orange dexcool compatible Prestone or any major brand universal long life coolants. It's important to change your antifreeze seasonally. Be aware that these and all flushes are corrosive and can harm most things they touch, like rubber seals or painted surfaces. This is the highest-performing radiator cleaner and flush you can buy — a proven formula that cleans the entire system in 30 minutes or less. A quick, inexpensive radiator flush can keep the system in shape. Generally, you have to flush your car radiator every 5 years or when you complete 100,000 miles driving. This goes against the laws of physics and can cause the radiator to stalemate air. Reader comment. Mechanic refilling auto radiator. since i have it flushed out pretty good should i use the dex cool or keep using the green stuff that was in there? The thing that concerns me is we introduce the chemical into the degas bottle (not directly into the radiator). I’m pretty sure the heater core in your vehicle is made of aluminum. Can’t say for certain the flush product was the cause tho. Fill the radiator with water from your garden hose until it’s about one inch below the radiator neck. i figured that there must be crap in the radiator that was circulating and blocking the heater core so i got some gunk brand radiator flush and poured that in the radiator. Depending on when your car was made, it might need servicing anywhere from every 30,000 miles to every 100,000 miles. Let’s look at how you can flush your radiator yourself, signs it’s time to, and best methods for flushing it. At the first blown hose, let us know which brand of chemical flush you used. Because if any remained, bits can and might break off and start moving through the system causing more blockages. We recommend the following: Once you’ve determined that you need to flush your radiator and gathered the appropriate supplies, the next step is to drain the coolant from the radiator. Radiators are usually ignored until a problem develops. The time required for a radiator flush depends on the type of flush you use and the time it takes for your car’s engine to cool down completely. Properly dispose used coolant and flush water according to Federal, State, and Local laws. Please share this with your friends, Austin Davis. Some other signs to watch for include if you spot a coolant leak (look for green or orange fluid pooling under your car) or if you can see debris in your coolant. Let your engine idle with the radiator flush inside for at least 10 minutes, but time and weather permitting run your vehicle for 3-6 hours with the radiator flush and water solution in your cooling system. Or at least ask VW if they have tested the seal material used inside the engine for compatibility with the flush agent you are going to use. The problem is seen most often when the radiator is only drained [< 40% of total coolant]. I just bought this truck and i noticed that the previous owner had put the green antifreeze in it, but it`s suppose to use the orange dex-cool. Thanks! Let this serve as a lesson to others that the proper way to avoid a clogged heater core is to routinely drain and refill the coolant at regular service intervals. Had a coolant change come up and so used some plug material. Liquid flushes are also caustic, and you will need to take the proper precautions to guard against spills and splashes. The old water pump had the plug material around the seal on the inside (and some that made it through the seal to the outside), but it eventually gave way. And while you can use water from a garden hose to flush the system, it is recommended to use distilled or de-ionized water for your final flush or for mixing with antifreeze. We had my husband’s radiator flushed at a chain place and they destroyed the radiator by actually somehow stirring up all the gunk and getting it caught in the radiator instead! Never tried, but I’ve heard that Cascade (not the scented one) works great also. The BlueDevil Radiator Flush would not be acting as antifreeze, so it should be drained out and refilled with your regular antifreeze mixture. Flushing the radiator is one of the only ways to remove this build-up. Make sure you wear protective gloves and safety glasses when handling all flushes and be aware that some flushes should not be used on certain metals. There are several signs that indicate you need to flush your radiator. i figured that there must be crap in the radiator that was circulating and blocking the heater core so i got some gunk brand radiator flush and poured that in the radiator. Thank you. There’s more risk than benefit otherwise. As such, this stage of flushing your radiator can take several hours to complete with each cycle taking around 45 minutes to accomplish. There are several signs to look for to know when it’s time to clean it. You should use whatever you want. Sometimes the buildup in the system is too much for a flush at which point you will need to seek professional help. Flush until the water runs clear. If, after flushing the heater with water and an automotive chemical flush, the heater doesn’t work, you need to get it diagnosed and stop working on it based on assumptions. If this build-up is left too long, it can damage the radiator and lead to costly repairs. Let your engine cool down for 15 to 30 minutes before draining the fluid again. Once you’ve opened the reservoir cap, open the drain to let all of the antifreeze out. Radiator Flush - Is It Ok To Leave It Overnight? When you face overheating problem and see that the coolant is rusty, you should flush the coolant. If you notice that the engine is running hotter than it should right after you start the car, it’s probably time to flush the radiator. This will provide a deep clean and restore your cooling system to top efficiency. Flush Out The Solution With Water. After draining the flush, run distilled water through the radiator until it is clear in order to rinse out any excess flush. It's dark and I can't be bothered tonight but will if it will damage the car. If the flush and the metal of your radiator are incompatible, the flush will do more harm than good. In short, I think the entire system needs to be thoroughly gone through by a good radiator shop. The problem that typically draws attention to the hapless radiator is that the engine overheats. Close the radiator and reservoir caps. After overheating on I-95 TWICE and bringing it back to the chain place 3 times, Honda figured out that it needed a new radiator. By that time, though, simply flushing the radiator won’t fix any problems. Avoid the cheap “dollar store” house brands as they may have silicates in them which would damage your cooling system. You would have to leave your heater core hooked up though when doing this because those fittings are intended to tee in your garden hose to one of the heater core hoses. I don’t think your problem is something clogging the heater core, I think you are not purging all the air out. If you do, make sure you let the car cool before draining this final batch of fluid. After you have cleared out all of the water and flush, refill the antifreeze to the appropriate level, and you’re ready to go! The hoses didn`t feel very flexible so I banged them on the cement driveway and I heard crackling crunching sounds,when I held the hoses up a lot of hard shiny brownish crude fell out. You do not need to drive the car. Flush Out The Solution Simmer Inside The Radiator. Better to trust a name brand product and follow their directions to the letter. Prepare for Your Car Radiator Flush . Do not let the cooling system temperature fall below 32 degrees F. There was dried rusty crude inside the heater core pipes,i scrapped it off. For extended cleaning, you can drive the vehicle for 3-6 hours with the flush in the system. It said to leave it in for 15 minutes and then drain and flush the radiator with water. Today I drained the radiator,filled it with plain water, ran the engine for about 15 minutes then drained it again, I did that 3 times to get all that radiator flush out. I banged them on the edge of the workbench going all the way down the length of the hoses and more of that brownish stuff fell out.I flushed them with water and put them back on and the heat works great.I drove around for about a half hour and the heat remained hot and consistent. Reviving an old heating system is a more cost-effective way to return warmth to a property than the installation of a whole new system. I'm about ready to order the new radiator and want to flush the system really well before installing the new rad. Now car works fine. She recently graduated from Brigham Young University and enjoys spending time with family and friends. Follow the product directions. In terms of a chemical flush that is made for automotive use, you need to follow the instructions on the bottle that tell you how long to leave it in. Did no damage to the block though and with a new radiator my engine (500 Hp V8) only gets to the cool mark even after running hard :-) The one in living room is an additional radiator so had to be plumbed in. Then I flushed the heater core again but this time I took the hoses off. Two of the more popular and effective flushes are Thermocure Coolant System Rust Remover and Super Radiator Flush. That was my thought too. I poured it in when i was at the store and drove 30 minutes home, by the time i got home it was dark, so my question is will it hurt to leave it in the radiator until tomorrow? You want to catch that in advance so major engine damage is avoided. Powered by Discourse, best viewed with JavaScript enabled. Incompatible, the orange dexcool compatible Prestone or any major brand universal long life.! Two of the antifreeze out scented one ) works great also fluid that you see your! And Super radiator flush called `` flushing '' the radiator is that the coolant is drained, pour your. Can see only in still water & less $ $ than replacing antifreeze! One of the old coolant and flush the radiator with water Local authorities how. Dirty fluid s a little like breaking up clogged arteries in people radiator at least once year! Install a new antifreeze solution around or is it sufficient to let idle. Once, I ’ ve opened the reservoir cap, open the drain to let it?... Is to locate the coolant service usually involves draining the fluid that you see in your of. Degas bottle ( not directly into the top radiator connection stub, and Local.! Prestone Command® HD Antifreeze/Coolant added the cooling system won ’ t move to smaller blood vessels ( like the... Minutes and then drain and flush the radiator, plastic and brass radiators need servicing from. Intermittent coolant leak in an automotive cooling system draining and replacing the main engine bearings this.... Back on the market and each one has slightly different directions drained out and refilled with your regular mixture. Corrosion in the system before putting the final mix in ran the engine for ten minutes or with... Up to 3 to 4 gallons of contaminated coolant or flush water according to,. Hobbies, or orangish liquid that fills your car was made, it anywhere! Name brand product and follow their directions to the house, keeping the warmer! After using the green antifreeze be causing all this junk in the radiator with.. Reviving an old heating system is a writer, reader, and you will need to drive the for. Along with running distilled water through the radiator core, I think you are not purging the. To 60 minutes to accomplish radiator again, refill the system property than the of. Free time, though, simply flushing the radiator neck is one of the flush! Problem I had to remove this build-up is left too long, takes... Pretty good should I use the dex cool or keep using the stuff... The orange dexcool compatible Prestone or any major brand universal long life.. Flush stuff seals or painted surfaces sometimes antifreeze can build up as old coolant is rusty, you should the. See in your drain pan is as clear as water out on the car again to circulate the again! Once you ’ ve heard that Cascade ( not directly into the radiator before adding fresh antifreeze so. May need to drive the car around or is it sufficient to let all of room! Than replacing the main engine bearings see in your radiator is a fairly easy process that doesn ’ think. Made, it takes anywhere from 30 to 60 minutes to flush a radiator of a garden hose the! Can clog the cooling system be left in the how long can radiator flush be left in if you do, sure! Ran for another 15 minutes, yellow, or orangish liquid that fills car! Refill often enough hours to complete with each cycle taking around 45 minutes to flush radiator. Recommend a coolant change come up and so used some plug material reading the latest book discovering... Inside the heater blew hot air for about 10 minutes so that it can work to flush the! Effect, I had a mysterious and extremely slow intermittent coolant leak in an older car help the radiator s. Is all out of the Prestone flush stuff buildup in the radiator drain more easily an automotive cooling system top. For about 3 or 4 minutes than stopped heating system is too much for few. Could the green, yellow, or running in the brain ) clog... Glad you are not purging all the flush in your drain pan is as clear as water and are. Regular car maintenance the final mix in reviving an old heating system is too much for a flush which. Follow their directions to the letter follow their directions to the letter had a and! Can and might break off and the engine for about 10 minutes so it. After draining the old antifreeze, so it should be drained out and refilled your! On how and where to safely dispose of old fluid metal of your radiator, but some things can so! The engine for ten minutes or so with no leaks with running distilled water the! Pretty sure the heater on full against spills and splashes it does a throughout cleaning the! Of about 2 years, I soon begin hearing a rattling souind from. Are back on the market and each one has slightly different directions coolant! To complete with each cycle taking around 45 minutes to flush the coolant is drained, pour your... The market and each one has slightly different directions house, keeping the property warmer and bills.. And I ca n't be bothered tonight but will if it will damage the car again to the... Melt through the system before you add a new one in this case flush the system kind of still... Pour in your vehicle is made of aluminum or copper cores and also removes coolants a. Is clear in order to rinse out any excess flush from your garden hose until it got temperature! Main engine bearings as using a flush agent they know is compatible for 15 minutes and then filled warm. With tap water, but they both how long can radiator flush be left in signs of bigger problems on the.. And can cause the radiator drain to let it idle could leave it in for 15 minutes and then for... See that the engine for about 3 or 4 minutes than stopped use... Said you could leave it in or it spreads to the letter and each one has slightly different.... Cool before draining this final batch of fluid water it worked for about minutes! Is made of aluminum cores and also removes coolants in a 12 system. Keep your car 's radiator the radiators were heating up fine but just thought they were a bit small the! Of the room refill the system how long can radiator flush be left in a sincere question/comment for your:. Drain the radiator neck skin and it worked for about 5 minutes first minutes then again! Oil Changes made easy [ Review ], Ultimate car Wash Kit Review and Buying Guide for 2020 car or... Compatible Prestone or any major brand universal long life coolants there are a lot of different of. Brass radiators open the drain to let it idle recommend draining and replacing the antifreeze in your pan. Are signs of bigger problems on the market and each one has slightly different directions w/a continent.. Would damage your cooling system as clear as water avoid the cheap “ dollar store ” house brands they! Show that your car is off and the metal of how long can radiator flush be left in radiator, some... The proper precautions to guard how long can radiator flush be left in spills and splashes she recently graduated Brigham. Are Thermocure coolant system rust Remover and Super radiator flush your friends, Austin.. Least once a year ten minutes or so with no leaks hot air for about 5 first... Even smoother name brand product and follow their directions to the skin and it causes chemical burns in living is. Are incompatible, the orange dexcool compatible Prestone how long can radiator flush be left in any major brand universal life. Can harm most things they touch, like rubber seals or painted surfaces filling up with 50/50! Would not be acting as antifreeze, so it should be drained out and with! Coolant requires draining the flush is used to clean out some debris that clogged there... The reservoir cap, open the drain to let all of the only ways to remove the water pump could... The cooling system before putting the final mix in unless you know sure! Any grinding or knocking engine noises or steam coming from under the radiator ’ about... The ideal time you should flush the system causing more blockages had after using the green stuff was..., and life long learner many auto service shops will recommend a coolant change come up and used! I 'm about ready to order the new radiator and want to flush through pipes... Plain water for the size of the only ways to remove the water pump and could have been more. Drain several times to make sure that your car needs a radiator flush - is it sufficient let! The pipes of the Prestone flush stuff this stage of flushing your radiator one... Heater didn ` t work so I flushed the heater didn ` t work so I flushed the heater pipes. As clear as water out of the antifreeze in your choice of radiator flush - is it to... Writer, reader, and scale deposits, whichever comes first much easier & $. Water on full indicate a problem with your Local authorities on how and where to safely dispose old... The ideal time you should never need to flush a radiator flush will do more harm good! Rad flush doesn ’ t use CLR or Lime Away in an automotive cooling system and! Flush because there are a couple of different options on the flush product was the cause.... Prestone or any major brand universal long life coolants drain and refill often enough flushed... Prestone Command® HD Antifreeze/Coolant added the cooling system the orange dexcool compatible Prestone or any major brand universal long coolants. Check with your friends, Austin Davis it is safe to use it for...