Dogbone
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I have a front driver turn signal in bumper good condition $20 plus shipping 714 580 0379
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(continued from below)
My advice, check and/or tighten your A/C drive belt.
Then check your static pressure on the low side without compressor running, should be around 80 psi or so on an 80 degree F day (rule of thumb, 1 psi per degree F).
When compressor is running, the low side should drop to around 35-40 psi.
Hopefully you'll find you simply need to tighten your A/C belt, and maybe charge your system.
Good luck!
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Bypassing the belt protection system should not affect the function of the pressure switch, located low behind the front grill near the radiator. Nor should it affect the function of the evaporator temperature switch that cycles compressor to prevent evaporator from freezing.
The clicking you hear was most likely the clutch engaging/disengaging rapidly. Something is causing the compressor to cut in and out. This could either be a loose connection or the pressure switch simply doing it's job, indicating an undercharge or overcharge condition.
The screeching, probably drive belt slippage, could be as simple as the A/C belt needing tightening, or worse the compressor seizing up.
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Hi, I'm troubleshooting an AC system on an 87 GL Turbo, I saw your reply has to a post from someone with an 88 DL in Arizona a year ago. I tried your belt protection system bypass and it worked, sort of. The compressor came on, then made a clicking noise, then a screeching noise. So I shut it down. In fact, when those two wires are jumped, the cmpressor is always on,..like a jumped the low pressure switch, not the belt protection system.. I double checked the wires selected and it all checks. ( red/gree & red/black) Any ideas?