Buick Repair Questions? Ask a Mechanic for Answers ASAP
Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.When the AC fails the system should detect it and set and store a fault code and or codes. Can you scan the system and see what the B code is that should be setting? Post back with the results and I will see if I can help you get this resolved.
Well with no fault codes to go on I think I would start with checking the power in and out of the AC compressor clutch relay . I have enclosed the wiring diagram in the link below to do this. Copy and paste the link to your browser to open and view it.https://dl.dropboxusercontent.com/u/104923897/Clutch%20relay%20un%2012.pdf
Check this when the system fails and let me know what you find.
If the fault is an electronic control issue there there should be a fault code and yes it is possible to over charge the system and it can affect it once the system is operating and can cause the compressor to kick off if the pressure is excessive. I would also be something like the clutch field coil getting hot in warmer weather and causing it to kick out. Is there any chance you can get me your pressure reading with the system running?
Normal pressure on a full system should be right at 35 to 40 PSI on the low side and right at 200 to 225 PSI on the high side.
Okay , Im here if you need me.