• | The condition may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
• | Inspect the air delivery system for the following conditions: |
- | An obstruction to the airflow |
- | Air leaks |
- | Misaligned air ducts |
- | Broken or binding linkages or doors |
• | If the scan tool indicates that the Door Actual parameter is 5-10 counts from the Commanded Door parameter, then perform the recalibration procedure for the HVAC door actuators. Refer to Actuator Recalibration . |
• | To prevent evaporator freezing, the recirc door periodically rotates back and forth from the outside air to recirc position. The tone of the blower and the velocity of the air speed may be noticeably different when the recirc actuator switches positions. This is a normal condition. If excessive air speed change is noticed inspect the cabin air filter for contamination or blockage. |
Step | Action | Yes | No |
---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views | |||
1 | Did you perform the HVAC Diagnostic System Check? | Go to Step 2 | |
2 |
Is the blower motor OFF? | Go to Step 3 | Go to Blower Motor Always On |
3 | Place the blower motor switch in each speed position. 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 in each speed position? | Go to Step 5 | Go to Blower Motor Malfunction |
5 |
Does the scan tool indicate that the Mode Select Position parameter displays the correct mode switch positions? | Go to Step 6 | Go to Step 8 |
6 |
Does the recirculation door move from the recirculation position to the outside air position? | Go to Step 7 | |
7 |
Does air flow from the auxiliary outlets when the front mode switch is in the defrost position? | Go to Diagnostic Aids | |
8 | 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 10 | Go to Step 9 |
9 | Replace the HVAC control module. Refer to HVAC Control Module Replacement . Did you complete the replacement? | Go to Step 10 | -- |
10 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |