PRESTONE AS105Y

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.

This is way over priced.

Item worked as advertised - Easy to use - suggest purchasing

I used this product on my 2007 Suzuki SX4 when I performed a coolant change while at the same time upgrading my coolant from the green stuff to something longer lasting (longer lasting blue coolant for Asian vehicles). Based on what I understood from the ingredients (which there were really two compounds) this cleaner is just a weak acid. The purpose of which is to dissolve some of the mineral accumulations or, more likely, minor rust in radiators. And while this product did give me an ease of mind when doing the coolant upgrade after having done a flush with tap water, I personally have my doubts of its efficacy for any radiator that isn't neglected for a fair bit of time. For me, since my radiator was decently taken care of, never had the chance to run on regular old tap water due to a bad incident, I did not see the Prestone flush as having done anything. Perhaps there were microscopic accumulations that it was able to dissolve but that didn't translate to anything substantial. With that said, given the price point, you might as well give it a try if you expect there to be a decent amount of rust or other mineral accumulations (perhaps from using non-demineralized water in the cooling system at some point). It may also be good to do this every once so often during a coolant change to make sure that things are clean. For severely blocked radiators or cooling system, this probably won't do anything. A more substantial or professional flush or parts replacement would be necessary. So just keep that in mind because I feel that while this product does work, it seems to over promise a bit.