GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Corvette 🢒 HVAC 🢒 Heating, Ventilation and Air Conditioning 🢒 Defroster Valve Actuator Replacement

Removal Procedure

    Object Number: 295305 Size: SH
  1. Remove the I/P upper trim pad. Refer to Instrument Panel Upper Trim Pad Replacement in Instrument Panel, Gauges 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 both of the vacuum harness connectors from the defroster vacuum actuator.

    4. Take note of which vacuum hose attaches to which side of the actuator.

  4. Rotate the defrost valve lever fully rearward (counterclockwise), then carefully insert a screwdriver between the bottom of the defrost valve lever and the protruding wall of the HVAC module case below the valve lever in order to keep the valve lever in place.

    5. Object Number: 295306 Size: SH
  5. Lift to release the defroster vacuum actuator retaining tab and begin to slide the vacuum actuator toward the passenger SIR bracket.
  6. Carefully rotate the vacuum actuator upward and forward until the actuator clears the passenger SIR bracket.

    7. Object Number: 295308 Size: SH
  7. Disconnect the vacuum actuator pushrod from the defrost valve lever and remove the vacuum actuator.

Installation Procedure

    Object Number: 295308 Size: SH
  1. Connect the defroster vacuum actuator pushrod to the defrost valve lever.

    2. Object Number: 295306 Size: SH
  2. Position the vacuum actuator along side of the passenger SIR bracket in line with the mounting pins on the HVAC module case.
  3. Carefully rotate the vacuum actuator past the passenger SIR bracket, rearward and downward, until the actuator slots align with the HVAC module mounting pins.
  4. Check that the vacuum actuator pushrod is not binding on the defrost valve lever.
  5. Push the vacuum actuator toward the HVAC module case to secure the retaining tab.

    6. Object Number: 295305 Size: SH
  6. Remove the screwdriver maintaining the defrost valve lever in position.
  7. Connect both of the vacuum harness connectors to the defroster vacuum actuator.

    8. The brown vacuum hose connects to the upper side of the actuator, the blue vacuum hose connects to the lower side of the actuator.

  8. Position and connect the RH side window defogger lower outlet duct to the windshield defroster duct.
  9. Install the I/P upper trim pad. Refer to Instrument Panel Upper Trim Pad Replacement in Instrument Panel, Gauges and Console.