How to replace the blower motor resistor that wont blow at all speeds on a Chevrolet Silverado

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ACDelco 15-80567 Control Module Kit


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Losing fan speed settings, is the most common complaint of a bad blower resistor.
On this 2001 Chevrolet Silverado  the customer has lost fan speeds 1 and 2.

These Parts can be found here.

On the 1999-2007 General Motor Truck Series the blower resistor is located near the blower motor, under the glove box.  To gain access to the blower resistor you have to remove a cover box, held on by two 7mm bolts.

On this vehicle the customer has a aftermarket floor mat making it difficult to remove cover, so we will work around it. Normally this cover would be removed.  The blower resistor is mounted by two 5.5mm bolts, with two wiring connectors.

One is a 2-wire pigtail coming off the resistor going to the blower motor. This one is hard to reach, use a small screw driver to release the connector tab.  The other is a 7-wire connector from the A/C control head. This connector should be inspected for damage, it is very common to find a melted connection here that would require the pigtail connector to be replaced also.

To install, first connect the wiring.  But, before completing the reassembly, test the system for correct fan speed operation.

*Tech Tip- If your finding yourself replacing the blower resistor for the second time, most-likely the blower motor is a fault. As the blower motor wears, it is very common for the motor to demand more amperage.  This demand of more amps often is too much for the resistor, causing the resistor to fail prematurely. Check APDTY.com for the Blower Motor for Your Vehicle.

Brian

ASE Certified Technician

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2 Responses

  1. Vince D says:

    The blower motor on my truck works when I connect it directly to the battery. I can not get any of the speeds, including high to work. New resistor is installed. A burnt smell was noticed before it quit. The resistor does not look burnt at all. It does not smell at all. I think it may be the harness, but I can’t find where in the harness this can happen. Any ideas?

  2. Taylor Sealy says:

    Thanks for the clear description with pictures! I have a 2003 Tahoe and the blower hasn’t worked on high with the heat on in a while but does now. The ac compressor has also been intermittently cutting out in spite of replacing all the obvious parts including the compressor, cutoff switches, compressor relay, and control panel so I am hopeful that this somehow solves that too.

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