How do I know if it is the AC compressor or fan causing AC/Heater to intermittently stop working?

Asked by May 20, 2015 at 10:38 PM about the 2003 Buick Century Sedan FWD

Question type: Shopping & Pricing

The air conditioner/heater of my 2003 Buick Century (156,000 miles) periodically stops
working for no obvious reason and can begin working again, also without any obvious
cause. I took the car to my local Firestone and was told it is the ac compressor and the
charge for fixing it is $1100. I don't think my car is even worth that much. Also, would
the compressor affect the heater too? My husband thinks it is a problem with the fan,
possibly a short. What do you think?

3 Answers

25

I recommend calling 3 garages for estimates near you to hear what each says. Because its going off when heating , thats not the cool air conditioning system. Possible loose wire under dash or fan wearing or something hitting its blades. Call another firestone?

74,065

Or faulty pressure switch,or relay.

78,085

If the fan is coming on and off it's going to be the blower motor, resistor block for the blower motor (a GM trouble spot), the blower motor relay, or the blower motor speed switch on the dash. I'd suspect the resistor block, or fan switch. In that order. HTH. -Jim

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