Getting very low amount of air flow from upper vents. Thanks for your help. I think there is a bulletin out on this. What is the web address?

Vehicle: Customer Interest
A/C - Low Airflow from Dash Vents on Full Heat
Bulletin No.: 03-01-38-013A

Date: December 09, 2003

TECHNICAL

Subject:
Minimal Air Flow In Vent Position With Full Heat (Disable Temperature Sub-Damper Door)

Models:
2002-2003 Buick Rendezvous
2001-2003 Chevrolet Venture
2001-2003 Oldsmobile Silhouette
2001-2003 Pontiac Aztek, Montana
with Front Manual (RPO C60) or Front Manual with Auxiliary Temperature Controls (RPO CJ3) HVAC Systems only

Condition

Some customers may comment on a lack of sufficient air flow from the instrument panel vents when the vent mode is selected and the temperature
control is at full heat. Others may comment that the volume of hot air flow from the instrument panel vents may seem to be less than the air flow
from the floor ducts.

Correction

Disable the temperature sub-damper door, located inside the air conditioning module, using the following procedure:

1. Turn the ignition key to the "ON" position and move the HVAC (heating, ventilation and air conditioning) temperature control to the full cold
position.

2. Turn the ignition key to the "OFF" position.

3. Remove the instrument panel closeout/insulator panel.

4. Remove the instrument panel compartment.

Important:
The mode door actuator described below may not be found on all vehicles. The actuator removal and replacement instructions are not
necessary if this actuator is not present.

5. Locate the mode door actuator on the passenger side of the HVAC module. Disconnect the actuator electrical connector. Remove the two
actuator retaining screws and the mode door actuator.



6. Remove the two screws that hold the mode door actuator mounting plate to the HVAC module. Remove the plate, exposing the mode door
levers underneath. Refer to the illustration above for the location of the mode door levers.



7. Locate the mode door lever, (1) in the illustration above. Remove the mode door lever by carefully lifting the lever locking tab and
simultaneously prying outward at the base of the lever with a flat screwdriver. Be sure to pry as close as possible to the base of the shaft to
prevent breakage of the lever.

8. With the mode lever removed, swing the temperature sub-damper door lever (2) fully up. This opens the door fully on the inside of the HVAC
module.

9. The sub-damper door may vibrate or fall closed if not secured in place. To ensure that this does not happen, use a plastic tie-strap to ensure
that the door is held in place.



10. Loop a tie strap through the channel of the lever. Loop the tie-strap over the upper actuator attachment boss, making sure to also get the strap
over the side ribs, as the side ribs are the locating feature for the actuator backing plate. Refer to the illustration above for location of the tie
strap.

11. Install the actuator mounting plate on the HVAC module. Make sure the plate is seated against the ribs on the mounting boss.

12. Install the mode door actuator onto the actuator mounting plate.

13. Start the vehicle and check the operation of the HVAC system mode doors and temperature controls.

14. Install the instrument panel compartment.

15. Install the instrument panel insulator/closeout panel.

TOC Admin
Brando