WYIN : AC Components to Replace? - PeachParts Mercedes-Benz Forum

Diseasel300 · #1 05-20-2018, 01:06 PM

There's no point in evacuating anything at all. You have nothing to evacuate!

Since you had dye, get the UV light and see if you can find the leak. Cross your fingers it isn't in the evaporator!

Things to replace? Every single rubber O-ring you can get your fingers on. ALL OF THEM. If they weren't replaced before, they're probably crapped out for sure by now. Also the filter/dryer. It should be the very last thing to go in, immediately before you have it pumped down in a vacuum prior to filling with refrigerant. Unless you find evidence of hoses leaking, leave well enough alone. The paranoia about hoses leaking is way overblown IMHO.

Rollguy: This is a W201, he should have a Denso and a system that should be able to handle R134a in its stock format.

ROLLGUY · #2 05-20-2018, 01:17 PM

Quote:

Originally Posted by Diseasel300

Rollguy: This is a W201, he should have a Denso and a system that should be able to handle R134a in its stock format.

Ahh, missed that

. I take back everything I said (well most everything). I agree about every Oring, and add that the compressor manifold seal (not exactly an Oring, but made of the same material) should be replaced as well. Did the system originally come with 134a? If it had R12 from the factory (I assume this), then it probably had mineral oil. I don't know for sure, but MB might have gone with Ester in the Denso compressors then, and that would be good. If it had mineral oil, and was retrofitted to 134a, that would be a problem.