CRC Thermocure Coolant System Rust Remover, 32 Oz, Rust Remover for Vehicle Cooling Systems, Removes Rust Scale and Deposits

I had sludge from HOAT mixed with DexCool. It worked well for cleaning it out and also cleaning out the rust off the cast iron block. I kept in in there about a month and around 500 miles with no issues. Easy to use and did what it claims without causing any issues. Just make sure to flush really good after using. Good option if you’re dealing with rusty or neglected coolant systems.

I have an older low mileage van where it appears that the cooling system just didn't get the regular attention a van with more miles and use might. This thing was probably stored for long periods of time. When I first bought it, it appeared to run hot at higher speeds but after some diagnostics the thermostat was determined to be the culprit. I looked into the radiator and it was an ugly rust brown mess. Several normal, no chemical additive flushes later the running hot problem still existed. At this point changing the thermostat probably helps but the corrosion in the cooling fluid, while it can be drained out, corrosion and scale would still be present on the heat exchange surfaces in the engine block, radiator and likely the now gunked up thermostat. Changing the thermostat without first treating the inner surfaces of the cooling system would only partially solve the problem. In this particular model of engine, a thermostat swap would also be a 3-5 hour ordeal - expensive. Enter Thermocure, and here are the caveats. Use it as directed but know that you will have to do more flushes to totally clean out the Thermocure. I did 6-7 post-Thermocure process before I started seeing clear water. What this stuff get out of your compromised cooling system is miraculous. On maintenance issues if I'm told to do it every 5000 miles, I do it every 3k. That's just me. I did the Thermocure flush twice, I used two containers, flushed a total of probably 10 times in all. But the interior of the cooling system is far cleaner, the van runs nice and cool, tak w longer to come up to operating temperature, and you can physically see the thermostat, now cleaned out, coming in and out depending on the stress applied to the engine. Before you use it, understand your vehicle's Hester core and why you have to run the heat in order to fully flush out your system. This stuff WORKS but know that you should probably take an extra step or two to get the best out of it. Simply adding some and draining the solution is only going part of the way. Add Thermocure, run engine for several hours, leave it in a few days, flush out solution, repeat, repeat several more times, repeat a couple more times in the interest of being thorough. This stuff works well and has saved me hundreds of dollars.

My wife bought a 1966 van and couldn’t get it to cool after a new water pump, new radiator, adding a fan shroud, lower thermostat and about everything imaginable. Engine would overheat after running about 5 miles. Finally, as a last resort I thought maybe there’s some rust blockage in the system. Tried Thermocure with clean water and after running it for a few hours the system actually drained dark black. Engine runs cool now. Not sure what makes it work but it works awesome!!

I added this product in my system, and after the first day, a freeze plug dislodged from my engine block. Fortunately the plug was replaced without major engine work. Really wish that didn't happen because there's some rusting in my coolant system, but now I'm too paranoid to add anything other than coolant. The amount of time this product was in the system, it did appear to remove a good amount of rust.

As endorsed by Steve Dulcich and David Freiburger this stuff works and can be left in your cooling system for a little while with no ill effects

This is by far the best coolant system cleaner for a rusty system. I removed the thermostat, drained and flushed system, filled with water and Thermocure and drove vehicle about 100 miles over a week period. Flushed again with water, replaced thermostat and filled with fresh coolant. Great product.

A few years back, the heater core on my 2002 S10 got plugged up. I took a gamble, disconnected it, and blasted it out with a garden hose. It worked—for a while. But within a year, it clogged again. I flushed it again and realized if it was getting that gunked up that fast, I should probably take a look at the rest of the cooling system. Sure enough, the coolant looked like rusty-orangey vomit. I drained everything, filled it with distilled water, ran it, flushed, and repeated. And every time, the water came out black and chunky. It was gross—and frustrating. After five full distilled water flushes and trying a few different chemical flushes, I still wasn’t seeing clear results. The gunk just kept coming. Then I came across this product. I added it to the radiator, ran the truck for a few days, and when I drained it—holy hell—it was nastier than ever. But after that? My flushes finally started running clear. I did a final rinse, refilled with new coolant, and now the S10 is running like new again. Bottom line: this stuff works. Yeah, it’s a bit pricier than other flushes, but it actually did the job—first try. Super easy to use too. Just pull out some coolant, pour this in, run the engine a few days, and boom—radiator clean as a whistle.

I would buy this product again

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