My 2005 GMC Sierra A/C works great and then stops....if I turn off the engine and re-start it....the A/C will work again...great. When it's working, everything sounds/and operates like normal, clutch engages....e-fans are operable, etc...no strange noises. When it stops working, the A/C compressor does not cycle even with the A/C turned on....also it doesn't appear to be a blend door or actuator issue.
When it first happened about 2 months ago, I took it to the local GMC dealer to ensure that I had the right pressures. They added a little bit of refrigerant...but it was doing the same thing when I drove it home from the dealer.
Since then, I've replaced the A/C relay, all three HVAC relays, the low pressure switch, the blower motor resistor, and the HVAC control head. The only thing that I haven't replaced is the hight pressure switch (which repair sites show as compressor mounted...but mine appears to be inline with a schrader valve).
I've looked at the other posts and have seen similar problems. I did see that Nacho mentioned that there was a procedure to fix the problem....too. Also, saw a Silverado post with similar symptoms....and he found it to be a dirty connector at his compressor....and cleaned it and it worked like normal again.
Any ideas? If someone could tell me about the procedure that Nacho mentioned to correct the situation....or any other ideas...that would be Great. Thanks.