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I had the same problem on my 91 RS 305. In the dash controls for the A/C,Heater,Defrost, there is a reistat. When I removed and disassembled it, one of the 3 internal springs had collasped allowing the circuit plate to lose contact. I cleaned up the copper circuits, stretched out the spring, and now everything works properly.

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Q: For some reason the fan blower 89 camaro rs on the defrost and heater isn't working all of the time sometimes it does and other times it wont?
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