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 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
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 B0414, B0424 or B3770? | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | 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 in Heating, Ventilation and Air Conditioning. 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 in Wiring Systems. 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 in Computer/Integrating Systems 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 |