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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 866 (Heating, Ventilation And Air Conditioning) >> Repair Instructions >> Mode Linkage Adjustment >> Adjustment Procedure

Adjustment Procedure

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the left insulator panel. Refer to CLOSEOUT/INSULATOR PANEL REPLACEMENT -- LEFT .
  2. Remove the knee bolster screws.
  3. Pull on the knee bolster to release the upper retainers.
  4. Remove the knee bolster.
    Fig 1: Mode Linkage Adjustment Procedure
    G01498941Courtesy of GENERAL MOTORS CORP.
  5. Locate to mode door linkage.
    Fig 2: Locating To Mode Door Linkage
    G01498942Courtesy of GENERAL MOTORS CORP.
  6. Open the push rod retainer clip (1) with a small flat bladed screwdriver.
  7. Disconnect the push rod (2) from the retainer clip (1).
    Fig 3: Open Push Rod Retainer Clip With A Small Flat Bladed Screw Driver
    G01498943Courtesy of GENERAL MOTORS CORP.
  8. Align the third thread (1) on the push rod with the end of the retainer clip.
  9. Close the push rod retainer clip.
  10. Inspect the air flow during the following conditions to verify proper operation:
    • No significant air bleed from the vent outlet during Heater mode.
    • Suitable air flow from the vent outlet during Bi-level mode.
      Fig 4: Align Third Thread (on Push Rod With End Of Retainer Clip.
      G01498944Courtesy of GENERAL MOTORS CORP.

    Important:  Perform the following if air bleed is felt from the vent outlet during Heater mode.

  11. Open the push rod retainer clip with a small flat bladed screwdriver.
  12. Disconnect the push rod from the retainer.
  13. Position the push rod so that the tip of the push rod will appear longer by one thread.
  14. Close the retainer clip and test again for air bleed.
  15. Repeat adjustment procedure if necessary.
    Fig 5: Open Push Rod Retainer Clip With A Small Flat Bladed Screwdriver
    G01498945Courtesy of GENERAL MOTORS CORP.

    Important:  Perform the following if there is no air flow from the vent outlet during Bi-level mode.

  16. Open the push rod retainer clip with a small flat bladed screwdriver.
  17. Disconnect the push rod from the retainer.
  18. Position the push rod so that the tip of the push rod will appear shorter by one thread.
  19. Close the retainer clip and test again for suitable air flow.
  20. Repeat adjustment procedure if necessary.
    Fig 6: Open Push Rod Retainer Clip With Small Flat Bladed Screw Driver
    G01498946Courtesy of GENERAL MOTORS CORP.
  21. Align the clips on the knee bolster with the corresponding slots on the I/P.
  22. Push in to secure the knee bolster to the I/P.
  23. Install the knee bolster screws.

    Tighten 

    Tighten the screws to 2.5 N.m (22 lb in).

  24. Install the left insulator panel. Refer to CLOSEOUT/INSULATOR PANEL REPLACEMENT -- LEFT .
    Fig 7: Installing Knee Bolster Screws
    G01498947Courtesy of GENERAL MOTORS CORP.
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