When it gets real cold I get sometimes only get cold air. I think that the blend door is sticking or the actuator is going bad. I almost afraid to ask ! but how do you get to the blend door and actuator?

Thanks

Joe B

 

what year? single zone or dual zone? Are both of the heater hoses hot?

 

OOPs, sorry, forgot that important info... the Uplander is a 2005 with single zone heater. The heater is back to working fine. The only time I seem to have a problem is when it gets real cold, like the other day when it got down to zero... then It's blowing only outside air. Since it works OK otherwise i'm thinking that the actuator is OK and the problem is that when real cold the housing ( plastic I guess?) shrinks and binds the blend door. In any case I need to get in there and check it out.

Joe B

 

Temperature Valve Actuator Replacement (Single Zone)
<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=1536779&pubCellSyskey=63237&p ubObjSyskey=1536779&from=sm&laborOpCode=&cellId=63 237#ss1-1536779">Removal Procedure

1. [*]

<A href="http://gsi.xw.gm.com/si/showDoc.do?docSyskey=1536779&pubCellSyskey=63237&p ubObjSyskey=1536779&from=sm&laborOpCode=&cellId=63 237#ss2-1536779">Installation Procedure

1. [*]

 

Actuator Recalibration

When replacing the HVAC control module, it will be necessary to allow the HVAC control module to perform a calibration process.
When installing the HVAC control module, be sure to perform the following:


Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted,
improper HVAC performance will result.

1. Place the ignition switch to the OFF position.
2. Disconnect the scan tool.
3. Install the HVAC control module.
4. Connect all previously disconnected components.
5. Start the vehicle.
6. Wait 40 seconds for the HVAC control module to self-calibrate.
7. Verify that no DTCs have set as current DTCs.

When replacing the HVAC actuator it will be necessary to allow the HVAC control module to perform a calibration process.
When installing the HVAC actuator be sure to perform one of the following:

Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If
interrupted, improper HVAC performance will result.

Preferred Method (w/Scan Tool)

1. Clear all DTCs.
2. Place the ignition switch in the OFF position.
3. Install the HVAC actuator.
4. Connect all previously disconnected components.
5. Start the vehicle.
6. With the scan tool, initiate the Motor Re-calibration feature of the Heating and Air Conditioning Special Functions menu.
7. Verify that no DTCs have set as current DTCs.

Important: Do not adjust any controls on the HVAC control module while the HVAC control module is self-calibrating. If interrupted,
improper HVAC performance will result.


Alternate Method (w/o Scan Tool)

1. Clear all DTCs.
2. Place the ignition switch to the OFF position.
3. Connect all previously disconnected components.
4. With the Mode **** in the PANEL position, press and hold the AC button for 5 seconds.
5. Rotate the Mode **** fully counterclockwise.
6. Rotate the Mode **** fully clockwise.
7. Rotate the Mode **** fully counterclockwise.
8. Release the AC button.
9. Wait 40 seconds for the HVAC control module to self-calibrate.
10. Start the vehicle.
11. Verify that no DTCs have set as current DTCs.

 

Shawn, thank you very much...
Joe B

 

good luck!

 

Hello, would a 2004 Chevy Tahoe use this same HVAC control module calibration?

Alternate Method (w/o Scan Tool)

Clear all DTCs.
Place the ignition switch to the OFF position.
Connect all previously disconnected components.
With the Mode **** in the PANEL position, press and hold the AC button for 5 seconds.
Rotate the Mode **** fully counterclockwise.
Rotate the Mode **** fully clockwise.
Rotate the Mode **** fully counterclockwise.
Release the AC button.
Wait 40 seconds for the HVAC control module to self-calibrate.
Start the vehicle.
Verify that no DTCs have set as current DTCs.

 

Any pointers on installing a replacement Air Door Actuator on a 2001 Buick Regal with Dual Zone cliamte control? I am currently getting Cold air on the Driver's side and hot air on the passengers.

Thanks

 

air conditioner works fine but, heat wont come on. blows cool air out when on heater. coolant level is fine and no leaks in car like the heater core is broke so wondering what problem could be. Thanks.