I got a problem running my a/c. My a/c seems to work just fine blows ice cold, however when I run it my engine starts to overheat. I dont' think the electric fan in the engine bay is coming on when I run my a/c. Anybody got any ideas on how to get it running again? Nobody at the local auto part stores seems to know anything about a sensor or switch or relay to tell that fan to turn on. Any suggestions would be appreciated.