I'm working on the A/C system in a 1991 Corvette, and having some issues. I'll try to be brief.

When the system was evacuated and charged with R-12 to OEM specs, the system short-cycled, and while the suction line was cold, the evap did not get cold, and vent temps were high. Evacuated again, tore system down, and found 90% of the oil was in the evap (over 8 oz), with hardly any in the accumulator or compressor. When I put those components in, I added 3 oz to the evap, 2.5 oz to the accumulator, 1 oz to the condenser, and 3 or 3.5 oz in the compressor (probably a little overfilled overall, I think the oil capacity is 8 oz system-wide).

Is this just a case of too much oil affecting evap performance?

Is this diagram of the flow in the evap appropriate? I cut the core apart and it was not what I expected to find...



Thanks for helping a novice...

-Andrew