Too Cold in Vehicle
WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
Too Cold in Vehicle
| Step | Action | Values | 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 HVAC Diagnostic System Check? | - | Go to Step 2 | Go to Symptoms - HVAC Systems - Manual |
| 2 |
|
- | Go to Step 3 | Go to Blower Motor Inoperative |
| 3 | Does the blower motor operate at the desired speeds? | - | Go to Step 4 | Go to Blower Motor Malfunction |
| 4 | Inspect the cooling system for the following conditions:
Refer to Heating Performance Diagnostic in Heating, Ventilation and Air Conditioning. Did you find and correct the condition? |
- | Go to Step 18 | Go to Step 5 |
| 5 |
|
- | Go to Step 6 | Go to Air Delivery Improper |
| 6 | Place the mode switch in the VENT or HTR positions Does the A/C compressor operate? |
- | Go to HVAC Compressor Clutch Does Not Disengage | Go to Step 7 |
| 7 |
|
- | Go to Step 8 | Go to Step 10 |
| 8 | Inspect the air temperature door and the air temperature actuator for the following conditions:
Did you find and correct the condition? |
- | Go to Step 18 | Go to Step 9 |
| 9 | Test the air temperature actuator control A and control B circuits of the air temperature actuator for an open or a high resistance. Refer to and in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 18 | Go to Step 10 |
| 10 |
|
- | Go to Step 13 | Go to Step 11 |
| 11 | Test the ignition 3 voltage circuit of the HVAC control module for an open, high resistance, or a short to ground. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 18 | Go to Step 12 |
| 12 | Test the ground circuit of the HVAC control module for an open or high resistance. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you find and correct the condition? |
- | Go to Step 18 | Go to Step 15 |
| 13 | Inspect for poor connections at the harness connector of the air temperature actuator. 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 18 | Go to Step 14 |
| 14 | Inspect the air temperature actuator, door and any attaching linkage for binding or a condition that prevents drive shaft rotation. Did you find and correct the condition? |
- | Go to Step 18 | Go to Step 16 |
| 15 | 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 18 | Go to Step 17 |
| 16 | Replace the air temperature actuator. Refer to Air Temperature Actuator Replacement . Did you complete the replacement? |
- | Go to Step 18 | - |
| 17 | Replace the HVAC control module. Refer to HVAC Control Assembly Replacement . Did you complete the replacement? |
- | Go to Step 18 | - |
| 18 | Operate the system in order to verify the repair. Did you correct the condition? |
- | System OK | Go to Step 2 |