in2pro

Condition/Concern:
When replacing the Front HVAC control head or an HVAC actuator it will be necessary to allow the HVAC control head to perform a calibration procedure. It has been found that when performing the "Actuator Recalibration" procedure on vehicles with either CJ3 or C67 Manual Hvac, the "Scan Tool" (Tech 2) method does not work properly. When performing the procedure with the Tech 2 it will NOT give any indication that it is not working properly.

Recommendation/Instructions:
At this time do not use the "Scan Tool" (Tech 2) method, use the "Alternate Method" (w/o Scan Tool) listed below.

Alternate Method (w/o Scan Tool)

1. Clear all DTCs AND REMOVE THE SCAN TOOL.
2. Place the ignition switch to the OFF position.
3. Remove the HVAC/BATT fuse for a minimum of 10 seconds.
4. Install the HVAC/BATT fuse.
5. Start the vehicle.
6. Wait 40 seconds for the HVAC control head to self-calibrate.
7. Verify that no DTCs have set.

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


EDIT: I have also found that this procedure may need to be done if the battery goes dead.