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How to Change the Resistor in the Blower Fan in a 2005 Silverado

Changing the resistor on the heater blower motor in your Silverado may be necessary if the blower will only run on one speed. When the resistor fails it allows full power to flow from the switch. This results in the fan running either on high speed or not at all, but none of the speeds in-between. Newer Chevy models do not use a traditional resistor; instead they use a controller, but the function is the same.

Instructions

1

Open the passengers side door of your truck and locate the sound insulator on the firewall just above the passenger floorboard. Pull the insulator back to expose the blower motor and HVAC duct under the dash.

2

Locate the controller on the face of the blower motor housing; identifying it by the wiring harness connection running from it to the blower motor. Disconnect the wiring harness connector from the controller and lay it aside.

3

Locate the two retaining bolts on the face of the controller and remove them with a socket and ratchet. Pull the controller off the blower and discard it.

4

Position the new controller on the face of the blower motor, insert the retaining bolts and tighten them with a socket and ratchet. Do not over tighten them or damage may occur to the HVAC housing.

5

Connect the wiring harness connector to the controller, snapping it into place. Push the sound insulator back in place and test the repair by running the fan through all the speeds, verifying it runs in all of them.

Posted by Unknown at 2:45 AM

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