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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 619 (HVAC SYSTEMS - AUTOMATIC)REPAIR INSTRUCTIONSDEFROSTER ACTUATOR REPLACEMENTREMOVAL PROCEDURE
1999 GMC Forward Control 5.7 R, Automatic

Removal Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal Procedure
WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the I/P upper trim pad. Refer to TRIM PAD REPLACEMENT - INSTRUMENT PANEL (I/P) UPPER in Instrument Panel, Gages and Console.
  2. Disconnect the RH side window defogger lower outlet duct from the windshield defroster duct, then reposition the side window defogger duct forward.
  3. Disconnect the vacuum harness connectors from the defroster actuator.
  4. Rotate the defrost door lever fully rearward/counterclockwise, then carefully insert a flat bladed tool between the bottom of the defrost door lever and the protruding wall of the HVAC module case below the door lever in order to keep the door lever in place.
    Fig 1: Keeping Door Lever In Place
    G01418987Courtesy of GENERAL MOTORS CORP.
  5. Lift to release the defroster actuator retaining tab and begin to slide the actuator toward the passenger SIR bracket.
  6. Carefully rotate the actuator upward and forward until the actuator clears the passenger SIR bracket.
    Fig 2: Releasing Defroster Actuator Retaining Tab
    G01418988Courtesy of GENERAL MOTORS CORP.
  7. Disconnect the actuator pushrod from the defrost door lever and remove the actuator.
    Fig 3: Disconnecting Actuator Pushrod From Defrost Door Lever
    G01418989Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.