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

I was dubious but needed to clean coolant system after two previous flushes dirtied after just a few days/ weeks. Used this and it did what I needed. Coolant system all clean - very satisfying. Expensive but when it works it is worth it

Worked beautifully!

I bought this as some reviewers on here and other internet forums have said that this removes 'stop leak' sealants from the coolant system.After using the product and following the instructions on the bottle, it made absolutely no difference at all. Total waste of money.

Not flushing the heater matrix.

This product seems to have done what it's supposed to di and cleaned my cars cooling system very effectively

Worked great. I wish I used it on my other car before I replaced the heater core

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.

Based on several online reviews I attempted to use this product to unclog a heater core. Followed the directions to the letter and it did nothing. If you're buying this for a clogged heater core don't waste your money.

Worked great but... If you have an older vehicle especially one with plastic on the sides of the radiator be prepared to be buying a new one. I was wanting to keep my 87 Ranger radiator because it was original and didn't leak at all. I knew the risk but went ahead with the flush. It worked really well. Follow the directions to the T. But the nearly 40yo radiator o-rings on the side tanks gave out. So I ordered a new aluminum one yay! It worked and I got a lot of crud out so I'd buy again.

I found no difference after using this product