Supercool TSI FFQ High-Temp A/C Flush, 32 fl. oz. (Flash Point Greater Than 250 F), White

Worked as advertised. Smells like orange citrus. Just make sure u vacuum the hell out of the system afterwards to boil off the remaining residue. I couldn't believe how much oil and crap came out of the original evaporator core. I prob could have used 3 bottles of this stuff. However, the one was all i got, and it was good enough. Next time id rather just replace the evaporator instead of flushing it. But u live and u learn. The evaporator and the lines were the only things i had to flush, everything else was new. If u got more parts than that to flush, better get 2 bottles. All i did was pour some into the line, and blow it thru with compressed air. As many times as i could until i ran out of flush. U can only pour in so much at a time until the line fills up. Repeat until its gone.

Worked great! But it’s messy and “seems oily”

Worked great flushing Evaporator and liquid like on 98 C1500 Chevy truck.

Good price for the quality and works good when cleaning out the AC system.

real good

Does what it should

Excellent

In a nutshell:Never having used oil-based flush before, I decided to try the Mastercool A/C Fast Flush, but to be on the thorough side, follow it up with a final solvent-based flush. After several passes with the Fast Flush, I was very disappointed to see how much particulates and gunk the solvent flush released (that the Fast Flush hadn’t removed). (I used Four Seasons 69994 Super Flush Solvent, which seems to be about the least expensive solvent-based flush.) The first photo shows fine aluminum particles (trapped in a filter) that the solvent-based flush DID get out, but the previous four flushes with Fast Flush DIDN’T. If I had it to do again, I wouldn’t use Fast Flush or any oil-based flush.In detail:There are basically two kinds of air conditioning flush: traditional solvent-based, and newer oil-based. All of the solvent-based flushes are highly volatile, typically flammable, not good for the environment, and not particularly good for your health. The oil-based flushes are generally far less volatile, not flammable, and generally not toxic. But the biggest difference between the two is that because the solvent flush is so volatile, it’s difficult to leave any behind in the components you are flushing. The oil based flush is just the opposite – very difficult to remove, as many have noted.I used about two quarts of Fast Flush to flush my evaporator and hoses. (I replaced the condenser, which had served as a rock shield for my radiator for 160K miles.) Initially, I was pretty happy with how much gunk the Fast Flush removed. But trying to flush the evaporator quickly showed a drawback – very difficult to remove. Using compressed air, I’d think I’d gotten it all out, but upon rotating the evap to a different orientation, more would get blown out. I did this four times, and every time, more flush came out. And don’t think of liquid in, liquid out. That’s what you have initially, but when you blow air through, you get big clouds of ultra-fine (but presumably non-toxic) mist out. This stuff does evaporate, but very, very slowly. The second picture shows some that spilled on my driveway a couple of days before the picture was taken. It’s definite not evaporating. This is pretty messy stuff to use.Initially, I envisioned that the final flush with the solvent flush would simply be removing the thin layer of Fast Flush oil that remained. As you can see from the particulates photo, there was more to it. I think a better way of thinking about the results of the Fast Flush was that there were small pools of liquid remaining – especially in the evaporator – and that those small pools contained particulates and gunk. The solvent-based flush dissolved the remaining Fast Flush, and carried it, the gunk, and particulates out of the system.The very limited Mastercool instructions on the can make it sound like a quick blast of shop air is all it takes to remove the flush. Don't believe it. And curiously, Mastercool doesn't even list this product on their website, but they do seem to feature their solvent-based product.Bottom line, for the price of a gallon of Fast Flush oil-based flush, I could have just about bought a brand new evaporator core. Buying a new evap, and using a quart of solvent-based flush for the hoses would probably have been a better idea.