1988 fiero gt, would not pull vacuum. Found ac compressor toast, able to force compressor to kick on by jumping the accumulator plug. Replaced with new compressor, upgraded the pressure switches on back of compressor, holds vacuum now. but compressor will not kick on. I even tried jumping the accumulator again...I think the ac compressor plug diode fell off, would that prevent the compressor from being able to kick on or forced on by jumping accumulator?

quote Originally posted by ceverhart: 1988 fiero gt, would not pull vacuum. Found ac compressor toast, able to force compressor to kick on by jumping the accumulator plug. Replaced with new compressor, upgraded the pressure switches on back of compressor, holds vacuum now. but compressor will not kick on. I even tried jumping the accumulator again...I think the ac compressor plug diode fell off, would that prevent the compressor from being able to kick on or forced on by jumping accumulator?

please read the manual and go through the diagnostic routines given. it's much much faster than getting correct information here.
if the diode fell off that would cause a bunch of issues

I have not worked on ac system that has a "diode" on the plug. When I was swapping the compressors out, what looked like the remains of protective tape/wrap fell off the plug. I examined the plug and it looked like it had a good dose of old oil on it and wires looked fine...when components replaced and system holding a vacuum the compressor would not kick on. Since the previous compressor worked I assumed plug good but when the new compressor didn't kick on I thought maybe the plug was oil fouled and would be easier to replace vs trying to clean out the oil. When I searched for a replacement plug I noticed what looked like a resistor on the plug and learned that there is diode on the plug. I think the diode fell off in the tape/wrap so I never knew it was there- I did use my camera to view the plug thoroughly and diode is not on it.... Since I have never worked on system with a diode on plug like that, I just wanted to know if it fell off -could it prevent the compressor from kicking on. I do have a new plug on the way and it will be a few days before it is delivered.

[This message has been edited by ceverhart (edited 10-03-2024).]