A/C and heat not changing over on driver's side

Hi,

Did it happen as soon as you replaced the passenger side? Have you tried replacing the driver's side as well? Here are the directions. The attached picture correlates with the directions.

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1999 Cadillac DeVille V8-4.6L VIN Y
Air Mix Actuator Replacement - Driver
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Service and Repair Procedures HVAC System - Automatic Air Mix Actuator Replacement - Driver
AIR MIX ACTUATOR REPLACEMENT - DRIVER

pic 1

REMOVAL PROCEDURE
1. Remove the right sound insulator.
2. Remove the instrument panel compartment.
3. Unsnap the rod from the plastic retainer on the actuator arm.
4. Remove the two screws from the actuator (2).
5. Disconnect the electrical connector (1).
6. Remove the actuator (2).
7. Inspect the air mix door for free travel.

INSTALLATION PROCEDURE

IMPORTANT: After replacing the actuator (2), re-calibrate the actuator (2) for proper travel. Cycle the ignition ON for 3 minutes to allow the programmer and the actuator (2) to re-calibrate for proper travel.

1. Install the actuator (2).
2. Connect the electrical connector (1).

NOTE: Refer to Fastener Notice in Service Precautions.

3. Install the two screws to the actuator (2).

Tighten
Tighten the screws to 1.2 N.M (12 lb in).

4. Snap the rod to the plastic retainer on the actuator arm.
5. Install the instrument panel compartment.
6. Install the right sound insulator.

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Let me know.
Joe

1999 Cadillac DeVille V8-4.6L VIN Y
Actuator Description
Vehicle Heating and Air Conditioning Air Door Actuator / Motor Description and Operation Components HVAC System - Automatic Actuator Description
ACTUATOR DESCRIPTION
ACTUATOR DESCRIPTION
The air temperature is controlled by the movement of an actuator. A dual zone system (CJ2) has the following 2 actuators:

The actuator on the bottom of the heating, ventilation, and air conditioning (HVAC) module assembly controls the temperature for the driver.

The actuator on the top of the module assembly controls the temperature for the passenger.

After replacing an actuator, re-calibrate the actuator for proper travel. Cycle the ignition "on" for 3 minutes in order to allow the programmer and the actuators to re-calibrate for proper travel.

Let me know if that helps.

Excellent! I'm glad to hear it's working. If you didn't re-calibrate the new one, it will cause issues. However, if you would have disconnected it, reconnected it and re-calibrated it, that should have taken care of it.

Regardless, it's working. That's what we wanted. Please feel free to come back anytime in the future if you need anything or simply have a question.

Take good care of yourself,
Joe

Hi,

The recalibration process doesn't require the A/C to be on or off. Basically, the system is resetting the travel distance.

Have you done this yet?

Joe

Hi,

As far as the control on the passenger side, it is likely a wiring issue.

The idea that the actuator is causing issues again is interesting. Have you rechecked your work to make sure nothing is loose or damaged?

Joe