Prestone AS105 Total Cooling System Cleaner for Radiator, Heater Core, and Hoses, 22 oz., 1 pack

Cleans out the system good.

Cleaned out a lot of the gunk from my coolant going bad. I'll probably have to do it two times because it was really bad.

Very good product when you're going to flush out your vehicle cooling system. It's not super acidic and will remove any rust or other contaminants that should be flushed out before you replace your coolant. Economical and price and very effective

I don't know if this worked or not because I only used it because this is the first time I have changed to coolant in my 2004 Suburban since I bought it in 12/2003. I drained that out and filled with straight water for 10 minutes of run time. Nothing bad came out so I had no clogs. I drained everything and changed the thermostat and a lot more water came out so I know that was a good drain. Filled to the top with 50-50.

Arrived quickly as expected. I haven't used it yet to clean the radiator on a 2017 Sonic but will as soon as the Texas heat goes down a bit. It has good reviews so I'm confident it will do a good job.

Great price on Prestone Radiator cleaner, so I bought 2.

Worked well. Been using this brand for many years. With nothing but great results

didnt do much for me

Extremely nice product. Its worth every penny.

My radiator had relatively clean coolant when I drained it, a couple of particles sure, then I filled with this cleaner and fresh deionised demineralised water, ran for 20 mins and oh my it was brown, so I drained again and repeated the process but left it in for 6 or there about a hours of driving, well super clean result it dislodged everything. I then refilled with water again dropped the bottom hose out and removed the thermostat and replaced with new and connected everything again, filled up with coolant as per spec and drive ensuring all air pockets were gone, took another small sample from the drain and it’s spotless coolant. I didn’t expect to go so far with it but when I saw the progress I had to keep going simply because of the way this works. Very impressed.

The flush and clean worked well,should have shopped around for price overpaid for product. Convenience has a price with it. Took a while to get

I used this to flush out my Jeep GC Limited. Work an absolute treat and was able to put in new radiator fluid. Would purchase again!

ONE OF THE BEST COOLANT CLEANER THAT I HAVE EVER USED, A REMINDER IT'S BETTER BEFORE YOU GET YOUR COOLANT FLUSH, TO DRIVE YOUR VEHICLE WITH THE ADDITIVE IN THE COOLANT FOR AT LEAST 6 HOURS. PLEASE READ LABEL.