Heater not working properly

2005 CADILLAC CTS

200,000 MILES • 3.6L • 6 CYL • 2WD • AUTOMATIC

CNASR

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In fact I have two problems with my heater system related to actuators.
- First the air is warm on passenger side while it's cool on my side (the driver one).
- Second problem is with the air flow distribution; in fact when setting the system to the defrost mode, the air still blowing from the center and both sides console without being concentrated only on the front windshield.

So can you help me please locating both actuators responsible of these two issues in my heater system?

Regards and thanks.

Jan 30, 2019 at 3:12 AM

ASEMASTER6371

CERTIFIED EXPERT
52,796 POSTS

Good morning,

The left side blend door actuator is on the left side of the heater case and is easy replacement.

I attached a picture and procedure.

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2005 Cadillac STS V6-3.6L VIN 7
Air Temperature Actuator - Left
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Service and Repair Procedures Air Temperature Actuator - Left
AIR TEMPERATURE ACTUATOR - LEFT
AIR TEMPERATURE ACTUATOR REPLACEMENT - LEFT

REMOVAL PROCEDURE
1. Remove the left closeout panel.

imageOpen In New TabZoom/Print

2. Disconnect the left air temperature actuator electrical connector from the actuator.
3. Remove the left air temperature actuator screws.

The mode actuator is another story. The dash board has to be removed to gain access to that one. This is a labor intensive job.

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2005 Cadillac STS V6-3.6L VIN 7
Mode Actuator Replacement
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Service and Repair Procedures Mode Actuator Replacement
MODE ACTUATOR REPLACEMENT
MODE ACTUATOR REPLACEMENT

REMOVAL PROCEDURE
1. Remove the instrument panel (I/P) carrier.

imageOpen In New TabZoom/Print

2. Disconnect the mode actuator electrical connector.

imageOpen In New TabZoom/Print

3. Remove the mode actuator screws (3).

Roy

Images (Click to enlarge)