A/C blowing warm air on passenger side vent

Tiny
CANDO1
  • MEMBER
  • 2008 CADILLAC STS
  • 3.6L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
Where is the A/C heater A/C defrost heat mode Control Door Actuator Motor part number 15939657 at and can I get to it?

Also the HVAC Air Adjustment Control Motor part number 89023395 located at and also can I reach it?

I know where the blending door actuators are right number 89023390 and left number 89023389.

I want to replace all 4. The right vent is warm with the A/C running and i'm getting clicking noises from inside the dash. I just want to replace them all. Thanks, Floyd
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Sunday, August 23rd, 2020 AT 8:13 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

The actuators aren't too easy to get to. I am going to provide the directions from the manual. You mentioned that you are okay with the blend doors, so I'm not including them. If you need them, let me know.

Here are directions for replacement. First is the mode door actuator. As far as the mode door, the instrument panel needs removed. I will provide those directions as well. All pics correlate with the directions.

________________--

2008 Cadillac STS AWD V6-3.6L
Mode Actuator Replacement
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Service and Repair Removal and Replacement HVAC - Automatic Mode Actuator Replacement
MODE ACTUATOR REPLACEMENT
Mode Actuator Replacement

Removal Procedure

1. Remove the instrument panel (I/P) carrier. Refer to Instrument Panel Carrier Replacement (See: Dashboard / Instrument Panel > Removal and Replacement).

Pic 1

2. Disconnect the mode actuator electrical connector.

Pic 2

3. Remove the mode actuator screws (3).

Pic 3

4. Remove the mode actuator.

Installation Procedure

pic 4

1. Install the mode actuator.

Pic 5

Notice: Refer to Fastener Notice.

2. Install the mode actuator screws (2).

Tighten the screws to 1 N.M (9 lb in).

Pic 6

3. Connect the electrical connector to the actuator.
4. Install the I/P carrier. Refer to Instrument Panel Carrier Replacement (See: Dashboard / Instrument Panel > Removal and Replacement).

________________________________________

Here are directions for replacement of the IP carrier. You aren't replacing it, but these are the directions I have which include removal and replacement.

_____________________________________

2008 Cadillac STS AWD V6-3.6L
Instrument Panel Carrier Replacement
Vehicle Body and Frame Interior Moulding/Trim Dashboard /Instrument Panel Service and Repair Removal and Replacement Instrument Panel Carrier Replacement
INSTRUMENT PANEL CARRIER REPLACEMENT
Instrument Panel Carrier Replacement

Removal Procedure

1. Remove the front seats. Refer to Bucket Seat Replacement (See: Seats > Removal and Replacement > Bucket Seat Replacement).
2. Remove the instrument panel retainer. Refer to Instrument Panel Retainer Replacement (See: Dashboard / Instrument Panel > Removal and Replacement).
3. Lower the steering column. Refer to Steering Column Replacement (without JL7) (See: Steering Column > Removal and Replacement > Steering Column Replacement (without JL7))Steering Column Replacement (with JL7) (See: Steering Column > Removal and Replacement > Steering Column Replacement (with JL7)).

Pic 7

Important: Note the position of the wire harness.

4. Disconnect the wire harness connector and clips on the drivers side of the vehicle.

Pic 8

5. Remove the wire harness clips in the center of the instrument panel.

Pic 9

6. Disconnect the wire harness connectors and the harness clips on the passenger side of the instrument panel.

Pic 10

7. Loosen the nuts securing the instrument panel carrier brackets to the pedal assembly.
The nuts do not have to be removed.

Pic 11

8. Remove the fasteners securing the carrier to the cowl.
9. Remove the bolt securing the carrier to the HVAC housing.

Pic 12

10. Move the carrier back away from the cowl far enough to disconnect the wire harness retaining clips off of the carrier.

Pic 13

11. Remove the carrier from the vehicle.

Installation Procedure

pic 14

1. Connect the wire harness retaining clips to the rear of the carrier.

Pic 15

2. Locate the carrier on to the pedal assembly brackets.

Tighten the nuts securing the instrument panel carrier brackets to the pedal assembly to 25 N.M (18 lb ft)

pic 16

3. Install the carrier to the vehicle.
4. Install the wire harness back into noted position.

Pic 17

Notice: Refer to Fastener Notice (See: Vehicle > Vehicle Damage Warnings > Fastener Notice).

5. Install the fasteners securing the carrier to the cowl.

Tighten the bolts to 9 N.M (80 lb in).

6. Install the bolt securing the carrier to the HVAC housing.

Tighten the bolt to 9 N.M (80 lb in).

Pic 18

7. Connect the wire harness connectors and the harness clips on the passenger side of the instrument panel.

Pic 19

8. Install the wire harness clips in the center of the instrument panel.

Pic 20

9. Connect the wire harness connector and clips on the drivers side of the vehicle.
10. Install the steering column. Refer to Steering Column Replacement (without JL7) (See: Steering Column > Removal and Replacement > Steering Column Replacement (without JL7))Steering Column Replacement (with JL7) (See: Steering Column > Removal and Replacement > Steering Column Replacement (with JL7)).
11. Install the instrument panel retainer. Refer to Instrument Panel Retainer Replacement (See: Dashboard / Instrument Panel > Removal and Replacement).
12. Install the front seats. Refer to Bucket Seat Replacement (See: Seats > Removal and Replacement > Bucket Seat Replacement).

________________________________________

The one above you identified as the air adjustment control motor I believe to be the fresh air door actuator. There is nothing listed as you mentioned.

Here are directions for that.

2008 Cadillac STS AWD V6-3.6L
Re-circulation Actuator Replacement
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Service and Repair Removal and Replacement HVAC - Automatic Re-circulation Actuator Replacement
RE-CIRCULATION ACTUATOR REPLACEMENT
Re-circulation Actuator Replacement

Removal Procedure

1. Remove the air inlet assembly. Refer to Air Inlet Assembly Replacement (See: Air Duct > Removal and Replacement > Air Inlet Assembly Replacement).

Pic 21

2. Disconnect the electrical connector from the re-circulation actuator.

Pic 22

3. Remove the re-circulation actuator screws (1).
4. Remove the re-circulation actuator.

Installation Procedure

pic 23

1. Install the re-circulation actuator.

Notice: Refer to Fastener Notice.

2. Install the re-circulation actuator screws (1).

Tighten the screws to 1 N.M (9 lb in).

Pic 24

3. Connect the electrical connector to the re-circulation actuator.
4. Install the air inlet assembly. Refer to Air Inlet Assembly Replacement (See: Air Duct > Removal and Replacement > Air Inlet Assembly Replacement).

___________________________________________

Here are the directions for the air inlet replacement.

2008 Cadillac STS AWD V6-3.6L
Air Inlet Assembly Replacement
Vehicle Heating and Air Conditioning Air Duct Service and Repair Removal and Replacement Air Inlet Assembly Replacement
AIR INLET ASSEMBLY REPLACEMENT
Air Inlet Assembly Replacement

Removal Procedure

1. Remove the instrument panel (I/P) compartment. Refer to Instrument Panel Compartment Replacement (See: Glove Compartment > Removal and Replacement).
2. Remove the closeout panel. Refer to Instrument Panel Insulator Panel Replacement - Right Side (See: Dashboard / Instrument Panel > Removal and Replacement) or Instrument Panel Insulator Panel Replacement - Left Side (See: Dashboard / Instrument Panel > Removal and Replacement).

Pic 25

3. Remove the upper air inlet assembly bolts (1).

Pic 26

4. Remove the lower right air inlet assembly bolt (1).
5. Slide the assembly to the right and then lower.

Pic 27

6. Disconnect the air inlet assembly electrical connector (1).

Pic 28

7. Rotate the air inlet assembly (1) and remove.

Installation Procedure

pic 29

1. Connect the air inlet assembly electrical connector (1).

Pic 30

2. Install the air inlet assembly (1) to the locator pin.

Pic 30

Notice: Refer to Fastener Notice (See: Vehicle > Vehicle Damage Warnings > Fastener Notice).

3. Install the upper air inlet assembly bolts (1).

Tighten the bolt to 9 N.M (80 lb in).

Pic 31

4. Install the lower right air inlet assembly bolt (1).

Tighten the bolt to 9 N.M (80 lb in).

5. Install the I/P compartment. Refer to Instrument Panel Compartment Replacement (See: Glove Compartment > Removal and Replacement).
6. Install the closeout panel. Refer to Instrument Panel Insulator Panel Replacement - Right Side (See: Dashboard / Instrument Panel > Removal and Replacement) or Instrument Panel Insulator Panel Replacement - Left Side (See: Dashboard / Instrument Panel > Removal and Replacement).

____________________________________________
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Sunday, August 23rd, 2020 AT 9:03 PM
Tiny
CANDO1
  • MEMBER
Darn this is the Bomb. It's almost impossible to get information on my model. Can you please give the blending doors as well? I'd like to look over the procedure before diving in. Thanks. I absolutely appreciate this beyond what I can say.
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Sunday, August 23rd, 2020 AT 10:48 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

The first set of directions are for the right side and the second, the left.

___________________________________________

2008 Cadillac STS AWD V6-3.6L
Air Temperature Actuator Replacement - Right Side
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Service and Repair Removal and Replacement HVAC - Automatic Air Temperature Actuator Replacement - Right Side
AIR TEMPERATURE ACTUATOR REPLACEMENT - RIGHT SIDE
Air Temperature Actuator Replacement - Right Side

Removal Procedure

1. Remove the air inlet assembly. Refer to Air Inlet Assembly Replacement (See: Air Duct > Removal and Replacement > Air Inlet Assembly Replacement).

Pic 1

2. Remove the right air temperature actuator screws (1).

Pic 2

3. Remove the right air temperature actuator.
4. Disconnect the right air temperature actuator electrical connector.

Installation Procedure

1. Connect the right air temperature actuator electrical connector.

Pic 3

2. Install the right air temperature actuator.

Notice: Refer to Fastener Notice (See: Vehicle > Vehicle Damage Warnings > Fastener Notice).

3. Install the right air temperature actuator screws (1).

Tighten the screws to 1 N.M (9 lb in).

Pic 4

4. Install the air inlet assembly. Refer to Air Inlet Assembly Replacement (See: Air Duct > Removal and Replacement > Air Inlet Assembly Replacement).

_________________________________

2008 Cadillac STS AWD V6-3.6L
Air Temperature Actuator Replacement - Left Side
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Service and Repair Removal and Replacement HVAC - Automatic Air Temperature Actuator Replacement - Left Side
AIR TEMPERATURE ACTUATOR REPLACEMENT - LEFT SIDE
Air Temperature Actuator Replacement - Left Side

Removal Procedure

1. Remove the left closeout panel. Refer to Instrument Panel Insulator Panel Replacement - Left Side (See: Dashboard / Instrument Panel > Removal and Replacement).

Pic 5

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

Pic 6

4. Remove the left air temperature actuator.

Installation Procedure

pic 7

1. Install the left air temperature actuator.

Notice: Refer to Fastener Notice (See: Vehicle > Vehicle Damage Warnings > Fastener Notice).

2. Install the left air temperature actuator screws.

Tighten the screws to 1 N.M (9 lb in).

Pic 8

3. Connect the left air temperature actuator electrical connector to the actuator.
4. Install the left closeout panel. Refer to Instrument Panel Insulator Panel Replacement - Left Side (See: Dashboard / Instrument Panel > Removal and Replacement).

_________________________

Let me know if this helps or if you have other questions.

Take care,
Joe
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Monday, August 24th, 2020 AT 2:07 PM

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