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Bob
Bob, Auto Tech
Category: Chevy
Satisfied Customers: 4087
Experience:  Plus 40 years GM, over 30 certified with Chevrolet, ASE certified Master Tech. (Expired, Retired)
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I HAVE A 2003 SILVERADO AND THE HEATER ONLY RUN ON HIGH..SAME THING

Resolved Question:

I HAVE A 2003 SILVERADO AND THE HEATER ONLY RUN ON HIGH THE OTHER SETTING WON''T WORK I HAVE REPLACED THE SWITCH IT STILL DOES THE SAME THING WHAT ELSE COULD IT BE?
Submitted: 8 years ago.
Category: Chevy
Expert:  Bob replied 8 years ago.

Hello, your problem is being caused by a defective blower motor resistor assembly. This resistor is what controls the amount of voltage that actually goes to the blower motor after the control panel switch is set. When you replace it, be sure to check for bad or burnt connections to it as well. They have been known to get pretty hot and burn the contacts in the plug in connector at times. Instructions below. Thanks

Blower Motor Resistor Replacement

Removal Procedure

  1. If equipped, remove the IP sound insulator.
    Object Number: 476821  Size: SH

  2. Disconnect the electrical connection from the blower motor.
  3. Disconnect the electrical connection from the blower motor resistor.
    Object Number: 382493  Size: SH

  4. Remove the blower motor resistor retaining screws.
    Object Number: 382503  Size: SH

  5. Remove the blower motor resistor.

Installation Procedure


    Object Number: 382503  Size: SH

  1. Install the blower motor resistor.
    Object Number: 382493  Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2. Install the blower motor resistor retaining screws.

    Tighten
    Tighten the screws to 1.6 N·m (14 lb in).


    Object Number: 476821  Size: SH

  3. Connect the electrical connection to the blower motor resistor.
  4. Connect the electrical connection to the blower motor.
  5. If equipped, install the IP sound insulator.
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