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The blower motor is the key to pumping in the air and if it's spent, nothing will pump. I would try replacing that first.

AnswerOn many mopar products there is a defrost resistor (I think that's what it is called) located on the passenger side on the very top of the firewall. This provides heat to the defrost vent system before the engine can deliver any heat. Sometimes one of the heater coils wil break or becom disconnected. If you remove the part the broken part should be apparent if not test the leads with a ohmmeter for continuity. AnswerI had the same problem. The wire to the heat, etc., fell behind the fuse box, so we ran a separate wire to that fuse, and it works like new.
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โˆ™ 2011-09-13 22:56:49
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Q: What could be wrong with your 1997 Dodge Avenger if the heater defroster AC and blower motor doesn't work but all fuses under the dash and hood have been checked?
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