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I just thought it maybe was some kind of fail safe, gas saver thing. The A/C in this truck had always worked fine, each and every time we've had it on. Then, one day we didn't try and run the A/C until a few miles after the low fuel warning, and the thing blew HOT air. The compressor was not kicking in, and I just knew the thing hadgone belly up. That's when I thought about a saver feature. Sure enough, after we filled up and drove a couple miles, the compressor would kick in, and the COLD air was back. It has worked perfectly ever since. Just a fluke maybe.