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Have you checked the blower motor resistor pack? They have been known to rust out.

It is located under the pass side dash right next to the blower motor. it has a plug about 2 inches wide with 3-5 wires on it. If your symptoms started with blower motor not working on all speeds this is most likely your problem. pretty sure this is only explained in the Haynes manual not the Chiltons. Part is a dealer item only. difficulty of this job is about a 2 only because it is so hard to get at. good luck

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Q: How do you figure out why your heater ac or defrost won't work 3 out 4 times when it does work its very weak and is on for a minute 1992 Chevy caprice?
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