Greetings yet again. My life sucks, but that's a different topic. I have been working on my 1997 Chevy Tahoe and its A/C system. The blower still blows warm air, and I have done the following:
1) Recharged the R-134a refrigerant, with A/C on "MAX";
2) Replaced the A/C Accumulator;
3) Checked the high pressure switch--- it is working.
4) Checked the electromagnetic clutch--- it is working.
5) Checked that the clutch is engaging against the pulley--- it is.
The only thing I can think of that might still be the problem is that the hub key could be missing or otherwise worn out, so that when the clutch engages it does not turn the compressor. I have cycles the A/C clutch off and on and off and on, and I detect no change of load on the engine--- the engine does not appear to be working harder when the clutch is engaged.
Is there anything else I might have missed?
Could it really be a missing or worn hub key?
I have a new hub key, as I bought one when I bought the new A/C Accumulator. I do not have a clutch puller.
David