I have an issue with my air conditioner on my 1989 GMC Suburban. Here are the current facts:
Converted to R-134 Compressor replaced (2x) Condenser replaced Dryer replaced Orifice tube replaced
The issue is that whenever I engage the AC, there is a lot moaning noise through-out the system. This noise has been present ever since I converted to R134 and replaced the components above. A mechanic first mentioned that the new compressor might have been bad. So I replaced it again (part was under warranty). After we flushed and evacuated the system the sound was still present. All tests are reporting good. Could this be caused by too much oil in the system? When I replaced the compressor and dryer, I did fill the system with the factory recommend 8oz (4 in dryer and 4 in compressor) of oil. I did tell the mechanic this before he charged the system, so I don't think he would have put more in there.
Thoughts?
Thanks, Mike Thompson
1989 GMC Suburban 3/4 Ton