Module, A/C And Heater: Operation

The A/C heater module utilizes integrated circuitry and programming to control the electronic functions and features of the Manual Temperature Control (MTC) heating and A/C system.

The A/C heater module receives the following request information from the A/C heater control over hard wired circuits:

• A/C Request
• Heating A/C System ON/OFF
• Recirculation Air Request

The A/C heater module monitors and controls the following over hard wired circuits:

• A/C Clutch Request
• Evaporator Temperature
• Recirculation Door Position

The A/C heater module is diagnosed using a scan tool. Prior to replacing an A/C heater module, run the calibration procedure to verify that the concern is not an air door calibration issue. Refer to STANDARD PROCEDURE .

The A/C heater module cannot be adjusted or repaired and must be replaced if inoperative or damaged.