Recommendation for brand/part number for A/C flush chemical?

When I overhauled my engine last year I removed the compressor and drained most of the mineral oil out of it. I put new seals on and drew a vacuum on the system and it held fine. However, I didn't charge it and left it as is. Now, assuming my compressor is still good, I want to flush the rest of the mineral oil out of the system including the evap and condensor coils. I'll replace the drier assembly. What can I use as a solvent to flush with, and will it evaporate out of the system with a compressed air purge? I've got access to shop air at all the CFM I would want. The system is R12, I'm converting to R-134A.

Thanks!

JazzMan

Reply to
JazzMan
Loading thread data ...

You didn't mention what vehicle you have.

On doing a retrofit to 134a, yes, you want as much of the mineral oil out as you can. You need to chareg the compressor with the right amount of new oil, and replace the accumulator (or drier) which will be holding most of any other oil in the system. There are only two other places where oil tends to accumulate and thats the condenser and any mufflers in the lines.

Honestly, if you are going to recharge the system with ESTHER based oil then don't sweat it. It will help to carry any mineral oil through the system without a problem. If you are going with PAG oil then you want to get it as clean as possible, even to the point of pulling the condenser out to blow it clear.

NAPA sells an AC flush kit and chemical that works, but's its $$ just to do one vehicle.

Now, if it's a Ford, give consideration to pulling the condenser no matter what. Ford uses such tiny passages that it's very hard to get the oil out in the vehicle, flush or no flush.

Best of luck!

Reply to
Art Welling

Art Well>

Oops! '88 Pontiac Fiero V6

The only real reasons I had to get the mineral oil out were to reduce the volume in the system that's wasted by it, and to reduce any problems from contaminants suspended in the oil. The system was open for about 6 months during the overhaul, and though I had plastic taped over the hose ends where the compressor had been removed, I doubt that would have kept it super clean.

Just curious, since I didn't re-add any oil to the compressor to replace what I drained out, would I need to remove the compressor to add oil back to it?

I was planning to use esther lube FWIW.

JazzMan

Reply to
JazzMan

MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.