Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The temperature cannot be adjusted, or the heating is insufficient. | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Important: If during this diagnostic procedure the HVAC control module is disconnected a recalibration of actuators must be performed to avoid misdiagnosis.
Does the scan tool display any DTC's? | Go to Step 3 | |
3 |
Does the blower motor operate in any of the speed positions? | Go to Step 4 | Go to Blower Motor Inoperative |
4 | Does the blower motor operate at the desired speed? | Go to Step 5 | Go to Blower Motor Malfunction |
5 |
Does the recirculation door move from the recirculation position to the outside air position? | Go to Step 6 | |
6 |
Does the A/C compressor operate? | Go to Step 7 | |
7 | Perform the Heating Performance Diagnostic. Refer to Heating Performance Diagnostic . Did you find and correct the condition? | Go to Step 11 | Go to Step 8 |
8 |
Does the Left Mix Door Actual and the Right Mix Door Actual parameters counts change? | System OK | Go to Step 9 |
9 | Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 11 | Go to Step 10 |
10 | Replace the HVAC control module. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 11 | -- |
11 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |