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 well. Follow directions closely. Their website says 10 mins run time in the direction video they have yet the bottle says 12 minutes. Be careful draining the hot coolant but the product works very well in my 25 year old jeep. Restored my heat from 90 at the vent to 135 degrees .

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.

Had zero heat .. flushed the engine twice with another product. Flushed the heater core directly with this. BOOM. 160 degrees out of vents on an 18 degree day. Will use again.. saved me a 3 day job ripping out the dash to change the core

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

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

Amazed at what came out. I did a complete flush with no cleaner 2 week before and hardly any flakes or grit. This time I isolated the heater core and used a fountain pump, a bucket, garden hose fittings, and two 10 foot garden hoses to circulate the Irontite (half the bottle, gallon of hot water, and whatever anti-freeze in the core) for the 12 minutes. Then I flushed core with another garden hose with a shut-off valve to pulse the flow. I reversed the flow probably a dozen times before the water came out clear always keeping the drain hose in a bucket to see what came out. I have a 2009 Wrangler and finally have heat on my left side,150 degrees and my right side went from 100 to 170 degrees.

Came as described

Worked beautifully!

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

Not flushing the heater matrix.

i used the product according to directions and it damaged my heater core now i have no heat in my truck at the beginning of winter this product sucks

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.