1987 Pontiac Firebird; a/c compressor not turning on.

Friendly format provided to inquire about automotive a/c systems.
Archived Forum

Moderators: bohica2xo, Tim, JohnHere

Post Reply
GMP440
Posts: 1
Read the full article
Joined: Tue Jul 03, 2018 12:50 pm

1987 Pontiac Firebird; a/c compressor not turning on.

Post by GMP440 »

Compressor not turning on. System has charge.
When you turn on system max a/c and a/c the cooling fans come on which is normal. Switch moved to other setting , defrost , etc everything else is working.
Used jumper wire from battery to compressor. Clutch activates ,compressor works and spins.
Pulled off electrical plug from pressure switch on accumulator to check voltage at plug. No voltage at plug when the system is on.
Don't know if its a bad relay or diode that is causing me not to get voltage to the pressure switch plug.
This is where I am at. Still trouble shooting. Any help is appreciated. Thanks. George
Post Reply