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ORIGINAL: fireeatn1

The A/C works and sometimes doesnt. No weird noises, nothing strange. We drove it to a fireworks show last night, 30min away, on the way it quit, so we stopped, turned it off, turned off the A/C(all switches), started the car with it off, then turned on the fan, A/C, and max A/C and PRESTO, it worked! When we got in to return, same order, and it worked all the way home. If we use this order, it will work. The dealership has replaced the A/C button, and Max A/C button, because the max A/C and A/C button had a short in they said, but didnt fix it, same problem. Took it back and they could get it to cycle everytime by grounding the Relay, I tried to jump the low pressure switch when it would shut off, and couldnt get anything. Pressure is perfect in the system everytime I check it. Tapped every part lightly, nothing, but ground the Relay under the hood, works everytime. The DEALERSHIP says its the ground circuit in the PCM, the part thru the computer that cycles it on and off, that the ground is going out, causing the problem. No SES lights, no trouble codes, no other problems. The dealership wants $1500 for the computer, since for this truck it is specific to this year, this setup, this motor, I got two used ones and neither work. I can take out mine, plug in the used ones, nothing, plug back in mine, and it works. I called the dealership, they said even if I ordered theirs off the shelf, you just plug it in, so I must have bad ones. I asked since I have keyless entry, and had seen write ups on cars with Keyless entry, and the dealership said as long as the part number is EXACT, it is just plug and go. There has got to be something else that needs to be done. I have one of the old ones here, and am getting another, so I will have two by this week, one from OR one from TN, and dont get what is up.