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Check the relay for the blower unit but my problem was the control switch in the dash was defective and the high temperature in the car would make it not work and also if I hit a bump it would not work sometimes. Rather than buy a new control unit my mechanic rewired an off on switch to the control for the air and heater and it works ok now. Saved me about $300.00

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15y ago
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Q: Why does air conditioner fan come on only when car is cool or after hitting a bump in the road?
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