New member
Jun 26, 2020
Got myself a Buick Roadmaster Estate Wagon 1996,
AC won't turn on, the clutch works if I remove the relay and put a wire there.
I have filled it with r134 so the pressure is fine.
It won't engage if I bypass the pressure switch either.
Seems lika an electrical problem but where should I start?

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New member
May 15, 2020
First place to start is to check you fuses. Second place after that since you know your compressor will run is to make sure the relay is getting the command to turn on the compressor. Your relay should have four terminals, when it is commanded on it should 1 power and 1 ground as well as the a terminal providing + current to be sent to the compressor. If you are missing any of these you need to figure out which one and go from there. I will post a schematic to help. You can also contact me for me detailed help. The first diagram is for automatic ac the second is for manual ac.