My heater in my car only works when it is on high. I have read that it means the one of the resistors is bad. Where are they located on a 1994 crown victoria. I see a couple of electronic boxes behind the glove box. Is one of them it?
Resistors controls the speed of AC/heater fan. When the resistors burn out your fan will only work on the "HI" setting. "HI" setting doesn't use any of the resistors and that's why it works. check your resistors..
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