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How do I replace a heater fan in a 1998 GMC V8 4 wheel drive Z71 pickup.

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  • Robert Greimann Nov 07, 2010

    Thanks I'm going to have get rid of some vehicles.Were at 6 now.Can't keep them all running.

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  • 749 Answers

The blower is located on the passenger side beneath the glovebox.



Removal Procedure

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.
    For Vehicles equipped with OnStar® (UE1) with Back Up Battery:

    The Back Up Battery is a redundant power supply to allow limited OnStar® functionality in the event of a main vehicle battery power disruption to the VCIM (OnStar®module). Do not disconnect the main vehicle battery or remove the OnStar® fuse with the ignition key in any position other than OFF. Retained accessory power (RAP) should be allowed to time out or be disabled (simply opening the driver door should disable RAP) before disconnecting power. Disconnecting power to the OnStar® module in any way while the ignition is On or with RAP activated may cause activation of the OnStar® Back-Up Battery (BUB) system and will discharge and permanently damage the back-up battery. Once the Back-Up Battery is activated it will stay on until it has completely discharged. The BUB is not rechargeable and once activated the BUB must be replaced.

  1. Disconnect the negative battery cable.
  2. Remove the instrument panel compartment. Refer to Instrument Panel Compartment Replacement in Instrument Panel, Gauges and Console.
  3. Remove the front screw from the right door sill plate.
  4. Remove the right hinge pillar trim panel. Refer to Body Hinge Pillar Trim Panel Replacement in Interior Trim.
  5. Disconnect the electrical connectors to the powertrain control module (PCM), as necessary. On diesel engines only, remove the PCM and the mounting bracket.

How do I replace a - jsmes1027_3.gif
  • Disconnect the electrical connectors from the blower motor (5), as necessary.
  • Remove the bolt from the right lower instrument panel support.
  • Remove the blower motor cover.
  • Remove the blower motor cooling tube.
  • Remove the blower motor flange screws (4).
  • Complete the following steps in order to remove the blower motor: • Carefully pull forward the blower motor in order to avoid distorting the blower fan. • Pry back the right side of the instrument panel, as necessary.
  • Complete the following inspection steps: • Inspect the blower motor terminals for distortion. • Clean any corrosion from the terminals, or replace the blower motor as necessary. • Inspect the flange of the blower motor for any damage or distortion that may cause an air leak. • Repair the flange, as necessary. • Inspect the blower fan for any damage or distortion.

  • Installation


  • Guide the blower motor (5) and the blower fan into position in order to install the blower motor Use care in order to avoid catching the blower fan on any protruding parts.
  • Install the blower motor flange screws (4).
  • Install the blower motor cooling tube.
  • Install the blower motor cover.
  • Install the bolt to the right lower instrument panel support.
  • Connect the electrical connectors, as necessary.
  • Install the mounting bracket and the engine control module (ECM).
  • Connect the electrical connectors to the ECM, as necessary.
  • Install the right hinge pillar trim panel. Refer to Body Hinge Pillar Trim Panel Replacement in Interior Trim.
  • Install the front screw into the front door sill plate.
  • Install the instrument panel compartment. Refer to Instrument Panel Compartment Replacement in Instrument Panel, Gauges and Console.
  • Connect the negative battery cable.
  • Test the circuit operation.
  • • Clean any corrosion from the terminals, or replace the blower motor as necessary.

    • Inspect the flange of the blower motor for any damage or distortion that may cause an air leak.

    • Repair the flange, as necessary.

    • Inspect the blower fan for any damage or distortion.

    Posted on Nov 07, 2010

    • Jonathan S
      Jonathan S Nov 07, 2010

      Disregard everything after testing the circuit.Some how duplicated on here.

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