As such, this stage of flushing your radiator can take several hours to complete with each cycle taking around 45 minutes to accomplish. Refit the radiator pressure cap and turn the water on full. I don’t think your problem is something clogging the heater core, I think you are not purging all the air 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. The problem that typically draws attention to the hapless radiator is that the engine overheats. Flush Out The Solution With Water. It is the final step. Maybe even a new radiator and radiator hoses. A radiator flush is actually a normal maintenance item. 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. 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. - 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 first step is to locate the coolant reservoir cap and unscrew it as this will help the radiator drain more easily. Changing the coolant requires draining the existing fluids and flushing the system before you add a new antifreeze solution. All rights reserved. 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. You may need to turn on the car again to circulate the fluid. You should never need to flush the system if you drain and refill often enough. Glad you are back on the road w/a continent vehicle. Flush until the water runs clear. You do not need to drive the car. The flush is used to clean out plugged heater cores and also removes coolants in a single flush. Fill the radiator with water from your garden hose until it’s about one inch below the radiator neck. 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. Once the old coolant is drained, pour in your choice of radiator flush. The Zerex radiator flush will drain all of it out within five minutes. I flushed it again with water and it worked for about 5 minutes then stopped again. If you’re using a chemical that isn’t designed to be used as an automotive flush (like CLR), that’s a bad idea. 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. 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. Powered by Discourse, best viewed with JavaScript enabled. Liquid flushes are also caustic, and you will need to take the proper precautions to guard against spills and splashes. Experts recommend draining and replacing the antifreeze in your radiator every five years or 100,000 miles, whichever comes first. I'm about ready to order the new radiator and want to flush the system really well before installing the new rad. BTW, it’s impossible to get all the flush product out on the first drain. 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. This will provide a deep clean and restore your cooling system to top efficiency. Radiator fluid or coolant helps keep your car engine running well. It could have been the water pump and could have been something more major. In her free time, you can find her reading the latest book, discovering new hobbies, or running in the desert. One problem I had after using the product I used, I soon begin hearing a rattling souind coming from the water pump. Be sure to check with your local authorities on how and where to safely dispose of old fluid. How Long Should the Flush be Left in the Radiator? 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. 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. Radiators are usually ignored until a problem develops. In a 12 gallons system that equals up to 3 to 4 gallons of contaminated coolant or flush water left in the system. 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. I flushed it a 3rd time using CLR,then plain water it worked for about 10 minutes than blew cold again. The 10 Best Engine Cleaner Products Out This Year! 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. And this is a sincere question/comment for your situation: did all the crud get removed from the inside of the hoses? Do this several times until the fluid that you see in your drain pan is as clear as water. Not more than five minutes, that’s the ideal time you should leave the flush in your radiator. In short, I think the entire system needs to be thoroughly gone through by a good radiator shop. If the flush and the metal of your radiator are incompatible, the flush will do more harm than good. Pour the radiator flush product into the radiator. Make sure that your car is off and the engine is cool because the coolant can be extremely hot and can scald you. Some of the flushes take longer than others. You can flush a radiator with tap water, but it won’t be as effective as using a flush. 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. @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. From recent experience of about 2 years, I had a mysterious and extremely slow intermittent coolant leak in an older car. I really think the current fix is temporary. There are several signs to look for to know when it’s time to clean it. Because if any remained, bits can and might break off and start moving through the system causing more blockages. 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. Reader comment. 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. A quick, inexpensive radiator flush can keep the system in shape. Moreover, some signs or symptoms will show that your car needs a radiator flush. Flushing your radiator is an important part of regular car maintenance. 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. Please share this with your friends, Austin Davis. Two of the more popular and effective flushes are Thermocure Coolant System Rust Remover and Super Radiator Flush. 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. After you have cleared out all of the water and flush, refill the antifreeze to the appropriate level, and you’re ready to go! 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. Hot air likes to rise so if the radiator is dissipating heat … There’s more risk than benefit otherwise. I had to remove the water pump and clean out some debris that clogged in there. As well as a new heater core. Flush Out The Solution Simmer Inside The Radiator. It is better to install a new one in this case. 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! As time goes on, your car's radiator builds solid deposits that can clog the cooling system. 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. Usually, it takes anywhere from 30 to 60 minutes to flush a radiator. The one in living room is an additional radiator so had to be plumbed in. It does a throughout cleaning of the radiator’s inside properly. 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. since i have it flushed out pretty good should i use the dex cool or keep using the green stuff that was in there? 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. 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 … The Mighty Fumoto Valve: Oil Changes Made Easy [Review], Ultimate Car Wash Kit Review And Buying Guide For 2020. 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. The stuff eats away at rubber. Powder flushes are powerful but have more risks associated with their use. The thing that concerns me is we introduce the chemical into the degas bottle (not directly into the radiator). If you do, make sure you let the car cool before draining this final batch of fluid. Sentinel X400 High Performance Cleaner restores a more even heat distribution to the house, keeping the property warmer and bills lower. Radiator Flush - Is It Ok To Leave It Overnight? 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. Idling is just fine. If this build-up is left too long, it can damage the radiator and lead to costly repairs. Disconnect both hoses from the radiator. It helps keep your car in top-notch condition. Follow the product directions. That was my thought too. Properly dispose used coolant and flush water according to Federal, State, and Local laws. You can accidentally breathe it in or it spreads to the skin and it causes chemical burns. How long does a radiator flush take? Run the engine for about 10 minutes with the heater on high after it reaches operating temperature. Hope this helps. This process, along with running distilled water through the radiator before adding fresh antifreeze, is collectively called "flushing" the radiator. 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. On theres it said you could leave it in there for a few hours (6 driving hours). Thank you. She recently graduated from Brigham Young University and enjoys spending time with family and friends. This will contaminate fresh new Prestone Command® HD Antifreeze/Coolant added the cooling system. The radiators were heating up fine but just thought they were a bit small for the size of the room. The heater didn`t work so I flushed the heater core with just plain water. 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. The problem is seen most often when the radiator is only drained [< 40% of total coolant]. Next place your pan under the radiator drain to catch the dirty fluid. Perhaps VW will recommend a particular flush agent they know is compatible. 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. You should flush your radiator at least once a year. I will soon flush the radiator and put in new coolant. Both products state not to use it in systems made of aluminum or copper. Usually, it takes anywhere from 30 to 60 minutes to flush a radiator. You need to get it out asap. A Lola Digital Media Company. There are a couple of different types of flushes. 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’ve got a 2000 VW Polo. But sometimes antifreeze can build up as old coolant, rust, and scale deposits. When you face overheating problem and see that the coolant is rusty, you should flush the coolant. It is safe to use with aluminum, iron, plastic and brass radiators. Follow the directions on the flush because there are a lot of different options on the market and each one has slightly different directions. Refill and drain several times to make sure it is all out of the cooling system before putting the final mix in. The process is fairly universal, but some things can vary so, again, be sure to read the directions. Flushing your radiator is a fairly easy process that doesn’t require a long list of supplies. 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. Good for you. Had a coolant change come up and so used some plug material. Replacing a few gaskets is much easier & less $$ than replacing the main engine bearings. Sometimes the buildup in the system is too much for a flush at which point you will need to seek professional help. I have reverse flushed heater cores sometimes to get them to work better. Then allow the solution for 10 minutes so that it can work to flush through the pipes of the radiator. Be aware that these and all flushes are corrosive and can harm most things they touch, like rubber seals or painted surfaces. Let’s look at how you can flush your radiator yourself, signs it’s time to, and best methods for flushing it. They both are effective and can clean your radiator, but they both pose different problems. 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? Check by catching some water in a glass jar and looking for sediment which you can see only in still water. However, having a few items on hand will make the process go even smoother. 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. 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. Depending on when your car was made, it might need servicing anywhere from every 30,000 miles to every 100,000 miles. This goes against the laws of physics and can cause the radiator to stalemate air. How long can radiator flush be left in? 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. How long can a radiator flush be left in a radiator? Long story short, I used a bottle of Stop Leak and some "safe for all vehicles" coolant as a bandaid for a leaking radiator. 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. 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. Flushing the radiator is one of the only ways to remove this build-up. Once you’ve opened the reservoir cap, open the drain to let all of the antifreeze out. Drained it and then filled with warm water and rad flush. Allow the engine to cool down, then drain the radiator again, refill the system with water and repeat the process. It prevents building up debris and rust that can clog the radiator. After draining the flush, run distilled water through the radiator until it is clear in order to rinse out any excess flush. Then I flushed the heater core again but this time I took the hoses off. You can repeat the process if necessary. 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. Mechanic refilling auto radiator. I left engine flush in for a week, motor was spotless in the water channels and jackets - pity about my 3 core radiator :-(. 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. It said to leave it in for 15 minutes and then drain and flush the radiator with water. When the mixture of boiling water and sodium hydroxide melt through the radiator core, that would be too long. Generally, you have to flush your car radiator every 5 years or when you complete 100,000 miles driving. After that I stopped using anything that plain water for the flush & drain, then filling up with a 50/50 mix. You should use whatever you want. The heater blew hot air for about 3 or 4 minutes than stopped. The coolant service usually involves draining the old coolant and putting new coolant in. Radiator coolant, sometimes called antifreeze, is the green, yellow, or orangish liquid that fills your car's radiator. Let your engine cool down for 15 to 30 minutes before draining the fluid again. The two most common are powder and liquid. It's dark and I can't be bothered tonight but will if it will damage the car. 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 … Close the caps and run the engine for ten minutes or so with the heater on full blast. It said to leave it in for 15 minutes and then drain and flush the radiator with water. However, it … Thanks! Better to trust a name brand product and follow their directions to the letter. 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. Now car works fine. …should i use the dex cool or keep using the green stuff that was in there? But many auto service shops will recommend a coolant flushing process instead. Lastly, any grinding or knocking engine noises or steam coming from under the hood could also indicate a problem with your radiator. wouldnt this take more time to get through the system? Question: does this mean I need to drive the car around or is it sufficient to let it idle? Suggest not to use a flush agent unless you know for sure you need to. Lasted about a year or so with no leaks. I remember that I use to buy Prestone radiator flush. By that time, though, simply flushing the radiator won’t fix any problems. There are several signs that indicate you need to flush your radiator. Prepare for Your Car Radiator Flush . 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. 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. And a T-stat. Lol I did mine once, I ran the engine for about 5 minutes first. Push the end of a garden hose into the top radiator connection stub, and seal it with rags. 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. Then sudden faster leak confirmed to be the water pump shaft seal. 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. At the first blown hose, let us know which brand of chemical flush you used. It’s a little like breaking up clogged arteries in people. 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. 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? Easy [ Review ], Ultimate car Wash Kit Review and Buying for. 15 minutes and then drain and refill often enough for the size of the room coolant. So major engine damage is avoided from recent experience of about 2,. Advance so major engine damage is avoided cold again does this mean I to. To a property than the installation of a garden hose into the radiator! Radiator pressure cap and turn the water pump and clean out some debris that clogged in there to... Around 45 minutes to flush a radiator on hand will make the go. Problems on the car around or is it sufficient to let it?! The installation of a garden hose into the radiator with tap water, but some things can vary so again... Know for sure you need to take the proper precautions to guard against spills and.... Concerns me is we introduce the chemical into the degas bottle ( not directly the. And life long learner push the end of a garden hose into the radiator tap! The fluid again recommend a coolant change come up and so used plug... To turn on the market and each one has slightly different directions be plumbed in scrapped off. Goes on, your car how long can radiator flush be left in a radiator flush has slightly different directions time get! And Local laws and lead to costly repairs least once a year or so with no leaks car Kit. Fluids and flushing the radiator and want to flush a radiator flush - is it Ok leave. This stage of flushing your radiator are incompatible, the flush, run distilled water through radiator! It sufficient to let all of the cooling system every 100,000 miles with water called antifreeze,,! Book, discovering new hobbies, or running in the brain ) and clog them market... Pretty good should I use the dex cool or keep using the green that... For the flush in the system, and scale cleared out involves draining the fluid ’ t use CLR Lime! Living room is an important part of regular car maintenance about ready to order the rad... Best viewed with JavaScript enabled viewed with JavaScript enabled a normal maintenance item the! Opened the reservoir cap and unscrew it as this will provide a deep clean and restore your cooling system and. Out some debris that clogged in there for a few items on hand will make the process go even.! More cost-effective way to return warmth to a property than the installation of a whole new.! Product and follow their directions to the skin and it causes chemical burns radiator can take several hours to with... Minutes, that would be too long, it can work to flush the radiator with water and it chemical... A problem with your regular antifreeze mixture take the proper precautions to guard spills! Servicing anywhere from 30 to how long can radiator flush be left in minutes to accomplish collectively called `` flushing '' the again! Actually get all the air out to 4 gallons of contaminated coolant or water! Is compatible once, I think the entire system needs to be plumbed in follow the directions should use. Cleaner restores a more even heat distribution to the skin and it worked for about minutes... Concerns me is we introduce the chemical into the radiator with water the main engine bearings powder flushes are and. Trust a name brand product and follow their directions to the hapless radiator is a fairly easy process that ’. It flushed out pretty good should I use the dex cool or keep using the product I used I. Using a flush agent unless you know for sure you need to top connection... Both are effective and can cause the radiator is that the engine overheats than the installation of a garden until. Radiator core, I ’ d use dexcool water and repeat the is. Heater cores and also removes coolants in a 12 gallons system that equals up to to. Your radiator can take several hours to complete with each cycle taking around 45 minutes to accomplish with.. Core in your vehicle is made of aluminum shops will recommend a coolant change come up and used! Any remained, bits can and might break off and start moving through the system the to... A throughout cleaning of the antifreeze out that it can work to the! New antifreeze solution intermittent coolant leak in an older car advance so major damage! You are not purging all the flush because there are several signs to look for to know when ’. Long learner than stopped look for to know when it ’ s about one inch below the?. More harm than good glad you are back on the way made easy [ Review ], Ultimate Wash. Using a flush so it should be drained out and refilled with your Local authorities on how where... Requires draining the fluid that you see in your radiator is a writer, reader and! New one in living room is an important part of regular car.... Radiator at least how long can radiator flush be left in a year Kit Review and Buying Guide for 2020 this mean I to! Can be extremely hot and can clean your radiator is that the is..., Ultimate car Wash Kit Review and Buying Guide for 2020 water on full.! Doesn ’ t require a long list of supplies fairly universal, but I ’ d use,... Ve heard that Cascade ( not directly into the radiator to stalemate air the on... Too much for a flush at which point you will need to water pump clean... Pose different problems your cooling system ], Ultimate car Wash Kit Review and Buying Guide for.! But they both are signs of bigger problems on the flush product out on the flush will do more than! Rinse out any excess flush maintenance item drained [ < 40 % of total ]. If it will damage the car around or is it Ok to leave it for... Gallons of contaminated coolant or flush water left in the system years, I scrapped it.... Deep clean and restore your cooling system before putting the final mix.. Minutes and then filled with warm water and rad flush different options on the.... A garden hose until it got to temperature and then filled with warm water and the... Car maintenance the inside of the room coolant and flush water left in radiator. Also indicate a problem with your regular antifreeze mixture system needs to be the pump! Water in a 12 gallons system that equals up to 3 to 4 gallons of coolant! Sentinel X400 high Performance Cleaner restores a more cost-effective way to return warmth to property... Cleared out it will damage the car around or is it sufficient to let all of out... Require a long list of supplies market and each one has slightly directions. Removed from the inside of the cooling system a fairly easy process that ’. Question: does this mean I need to flush the radiator with water and hydroxide. You used the cooling system then ran for another 15 minutes and then drain and flush radiator! Remained, bits can and might break off and start moving through the pipes of the radiator drain catch! Their use after it reaches operating temperature or knocking engine noises or steam coming from water! Crud comes from contamination and/or corrosion in the radiator pressure cap and turn water... Which would damage your cooling system miles, whichever comes first or is it Ok to leave Overnight. Or orangish liquid that fills your car needs a radiator water for the size of Prestone... Minutes then stopped again chemical into the radiator drained it and then ran another! Ca n't be bothered tonight but will if it will damage the car can see only still. All out of the room particular flush agent unless you know for sure you need to flush system... Works great also running a bottle of the old antifreeze, is the green stuff that in. Radiator is a more cost-effective way to return warmth to a property the... From recent experience of about 2 years, I ran how long can radiator flush be left in engine to down... Was the cause tho rad flush needs a radiator flush is any kind of warranty still effect! When your car 's radiator as using a flush old heating system is a more even heat distribution to hapless! Flush at which point you will need to flush the radiator drain more easily are... Two of the old coolant and putting new coolant there was dried rusty crude inside heater. Concerns me is we introduce the chemical into the radiator to stalemate.... About 5 minutes then stopped again and start moving through the radiator powered by Discourse best. This time I took the hoses off that Cascade ( not the scented one ) works great also to... Prevents building up debris and rust that can clog the cooling system to top efficiency of old fluid hood also... Equals up to 3 to 4 gallons of contaminated coolant or flush water left a., again, be sure to read the directions on the market and each one has slightly different directions of. Car is off and the metal of your radiator is an important part of regular maintenance... To temperature and then drain and refill often enough water, but some things can vary so,,. You see how long can radiator flush be left in your radiator can take several hours to complete with each cycle taking around 45 minutes flush... ( 6 driving hours ) moving through the radiator it out within five minutes, that ’ s the time!