Join Date: Dec 2011
Location: Corpus Christi, TX
OK, I'm thinking it may be a condenser fan problem. When the engine is cold and the A/C is turned on it is my understanding from some research I've done that the fan should turn on. the conditions that turn it on are either coolant temperature, or A/C line pressure. I'm guessing I had no problem when I had a warm engine because the fans were running. And likewise I didn't have a problem when I had a cold engine and immediately drove the car since air was moving across the condenser.
So, the question now is where in the world do I start. Since I know the fans run when the engine is warm Relays are likely good. I have an OBDII Bluetooth scanner on the way that I can use with software on my Android phone or laptop. I'm hoping it will allow me to read sensor data Like maybe the A/C pressure reading. My guess is to start at the sensor and work towards the fan relay. From what I can see the A/C pressure sensor feeds into the PCM which I'm guessing controls the fans based upon a logic circuit inside which has the parameters for fan operation. Looks like I need a test procedure for the A/C pressure sensor and go from there. I'm going to look that up and see what I can find. My thinking also is that the pressure sensor should cut out the compressor clutch if it senses pressure beyond a preset value but I don't know. I'm thinking that if it were working properly then it would cut out the compressor before pressures got high enough to blow the relief valve.
What does anyone think? Does it sound like I'm heading in the right direction?