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The Blower Motor Resistor Pack is defective. Replace it. Replace the resistor module for fan motor speeds. It's located under the dash on the passenger side behind the blower. Need to be a contortionist to change it (have to lay on back in floorboard with legs hanging out of the car....lots of fun *grin*) All it takes it a very small 7/32 socket (for back one recommend swivel socket). There are only 4 screws (3 on blower and 1 on resistor) that you need to remove. Part was less than $20 at local AZ. There are wires at a connector on the blower....trust me its easier to just snip them than to try to undo the connector. The new resistor comes with one anyway.

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Q: Why on a 2000 grand prix gt does the heater not blow until put on 4 same for the ac?
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