[W126 Coupe] AC Problem Part 3

[Dick Spellman]

Hi Tom:

I would begin to guess that the clutch on the compressor is going (slipping).  High speed gets just enough turns on the compressor to get cool air and low speed the slippage is marked by poor cooling.

I can only base this on your continuing belt trouble which only involves the pulley and clutch where you repaired the idler pulley previously and the fact that you say your engine coolant temps are in line with 85-95 (even 110) are all okay.

Just a guess but, I 'd have that compressor clutch checked and if that's not it you've got a gremlin in there that goes beyond normal means to repair.  Last thought, was this R-12, R-134A at 80% or some other refrigerant???

One last dumb question, independent of the air movement at 75 MPH does the ACC fan work at all speeds and does the air flow freely out of the center vents when AC switched ON??

Dick
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