HVAC Air Outlet Shut-off Door(s) Close w/Blower on High (Install Washer(s))

This bulletin is being revised to update text and warranty information.

Please discard Corporate Bulletin Number 00-01-39-001 (Section 1 -- HVAC).

Some customers may comment that one or more of the instrument panel (IP) air outlet vent shut-off doors may close when the blower fan is on high.

This condition may occur when the HVAC system is set for automatic operation or when the air outlet shut-off door is manually adjusted to the open position.

This condition may be due to the control lever on one or more of the air outlet shut-off doors not having sufficient tension to stay in the open position when the blower fan is on high.

Install washer(s), P/N 5462496, between the air outlet duct housing and the control lever at the pivot point in order to increase the tension. Refer to the following repair procedure.

1. Remove the IP upper trim pad. Refer to the Instrument Panel, Gauges and Console sub-section of the Service Manual.
2. Remove the hazard warning switch.

2.1.	Disconnect the electrical connector.

2.2.	Release the locking tabs on the hazard switch.




3. Remove the control lever from the air outlet shut-off door (1).

3.1.	Insert a small flat-bladed bent screwdriver or similar tool into the control lever's groove (2).

3.2.	Push the tool into the air outlet duct housing and press down on the locking tab.

3.3.	Pull out the control lever.

4. Install one (or as many as is required) washer (3), P/N 5462496, over the pivot end of the control lever.
5. Install the control lever to the air outlet shut-off door.

5.1.	Ensure the control lever is connected to the thumbwheel linkage (4).

5.2.	Press the control lever into the air outlet shut-off door until the locking tabs lock.

5.3.	Verify that the air outlet shut-off door operates properly by rotating the thumbwheel (5).

6. Install the hazard warning switch.

6.1.	Press the hazard switch into the bezel until the locking tabs lock.

6.2.	Connect the electrical connector.

7. Install the IP upper trim pad. Refer to the Instrument Panel, Gauges and Console sub-section of the Service Manual.

Parts are currently available from GMSPO.

For vehicles repaired under warranty, use: