What's the best thing to flush your A/C system with?

I've heard rubbing alcohol, mineral spirits, liquor thinner, benzene, that stuff they sell in a can for $12 / quart called A/C flush… Anyone know the real answer?

Thanks!

Matt

 

A/C flush in the can.

 

I wouldn't put anything corrosive or flammable (benzene, etc.) through your lines. The liquid stuff in the bottle is best. You will need a flush gun and compressed air to use it. I rented a flush gun from AutoZone to do mine last year. Also, not sure if you know or not, but don't run any flush through a compressor or accumulator (it will saturate the dessicant bag). It's only for the lines, evaporator and condensor (if it's a serial flow condensor).

If you don't have air, I think AutoZone sells flush in an aerosol can, but I would be cautious of what sort of propellant is used in that can. It may be fine but just check to be sure before using it.

 

Borrowed a flush gun and bought the dedicated A/C Flush.

Which by the way says "DANGER -- Extremely combustable Liquid!" right on the front.

Wouldn't most quick drying solvents be flamable...

Thanks for convincing me to get the real deal stuff though, works pretty well.

 

with household acs we use r11 flush:P then follow it with nitrogen!