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Makes 🢒 Chevrolet 🢒 2003 🢒 TrailBlazer - 4WD 🢒 Bulletins 🢒 SMU - Revised Mode Actuator Replacement Procedure

SMU - Revised Mode Actuator Replacement Procedure

Subject:Revised Mode Actuator Replacement Procedure

Models:2003 Chevrolet TrailBlazer, TrailBlazer EXT
2003 GMC Envoy, Envoy XL
2003 Oldsmobile Bravada
2003 Isuzu Ascender


This bulletin is being issued to revise the Mode Actuator Replacement Procedure in the HVAC Systems with A/C - Automatic sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information.

The following information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.

Mode Actuator Replacement

Removal Procedure

  1. Remove the left floor air outlet duct. Refer to Air Outlet Duct Replacement - Floor, LH in Heating, Ventilation, and Air Conditioning.

    2. Object Number: 735989 Size: SH
  2. Disconnect the electrical connector from the mode actuator.
  3. Remove the screws from the mode actuator (3).
  4. Remove the mode actuator.

Installation Procedure


    Object Number: 735989 Size: SH
  1. Install the mode actuator (3).

    2. Notice: Refer to Fastener Notice in Cautions and Notices.

  2. Install the screws to the mode actuator  (3).

    3. Tighten
    Tighten the screws to 1.9 N·m (18 lb in).

  3. Install the air outlet duct. Refer to Air Outlet Duct Replacement - Floor, LH in Heating, Ventilation, and Air Conditioning.