Irontite Thoro-Flush Coolant System Cleaner - Removes Rust, Scale, Oil, Sludge & Gelled Dex-Cool - 16oz Powder - Cleans Cooling Systems, Restores Coolant Flow, Safe for Cast Iron, Aluminum & Plastic

Works extremely well. Flushed the system and haven't had a cooling issue since.

This stuff ate the junk out of the radiator of the car next to me, it's that good. I have a VW Jetta Diesel that had a mystery water leak for quite a while. The PO dumped an asinine amount of 'stop-leak' into it, trying to fix it, to no avail. When I bought it, the system was so plugged up, the heater wouldn't work and the thermostat was glued open. I tore into it and found the leak, the water pump o-ring, under the timing cover. The vanes on the water pump were covered in goo, you could see caked up crap in the passages behind it. I thought I'd be hunting for a new car, but decided to give this stuff a try on the recommendation of a friend. Mind you, this system was so plugged up, it barely held a gallon of coolant, and the fans were running almost constantly.I went a step beyond the instructions, I replaced the thermostats, and flushed the system as best as I could with hose water, then drained it with a suction pump. I then filled it as the instructions recommended, and topped it off with distilled water. After the first 15 minutes, the recommended time, the heater started to work. I let it go 30 minutes, twice the time it said on the instructions. The water in the reservior looked like mud at this point and I was concerned about it eating the seals and gaskets in my engine.It took over an hour to completely flush the system after using this and get clear water running out of it, at first, there was goo coming out in clumps, it looked like river mud. After it cooled down, I again used the suction pump to be sure it was drained, used a scope to inspect the radiator, it looked like a new one inside, then I refilled it. It took the full gallon and a half of coolant to refill. It's been running fine ever since, the fans hardy ever come on, even with the A/C running.

The product works well, the only downside, you will have to do a clean water flush several time to remove.Oh, and it does not taste that great either.I preformed the flush without removing the thermostat, and when the bottle states, do not run for more the 15 minutes, please be aware, it means a max of 15 minutes. At the 13 minute mark the vehicle started to heat up - quickly.

2020 Ram 2500. Flushed heater core. Heat is working properly on drivers side now. Filtered the flush and lots of junk came out.

Got it fast.Heard it is a great product.

Not too impressed. It cleaned some but still left residue in the motor

The media could not be loaded. I had my heater core on my Jeep Wrangler done at a cost of 1900.00 total for the 18 shop hours of labor. Shortly after I got a small leak in my radiator. I had no real idea of the cooling system and how it worked very much at all. I put a bottle of stop leak in the radiator to fix the small leak which it did not do. I had to replace my radiator with a new one. Come winter time I went to use the heater only to find I had no heat from vents. I saw this product on YouTube and decided to try it. Used as directed. Backflushed the heater core and tons of stop leak came out into the 5 gallon bucket. Problem solved in one shot. Great stuff will use again.

I used this to remove some stubborn stop leak adding during a long road trip, and which was not really needed as it was a dripping hidden hose. Afterwards, the radiator wouldn't properly cool on the hottest Texas days, this flush remedied that problem. ONE way of determining that a radiator may be clogged is quite simple. if on a hot day, you drive at highway speeds and your temperature goes up while moving at normal highway speed (WHILE MOVING AT HIGHWAY SPEED - not well in excess of nor in stop and go), if the temp goes higher, this is a sign that the extra wind aided cooling is not effective because the entire radiator is not flowing the coolant, i.e. some paths within the radiator are clogged, so the extra heat created by the engine at highway speed is not cooled by the partially clogged radiator. in a proper system, the temperature should not go up., and very often goes down depending on speed and weather conditions. Remember this is but one "cause and effect", there could be other reasons a cooling system is not functioning properly, but for me this was exactly it.