Test Description
WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
The number below refers to the step number on the diagnostic table.
- 3: This test resets the HVAC control module and checks for current air temperature actuator DTC.
Too Cold in Vehicle - Auxiliary
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The auxiliary air temperature cannot be adjusted from one or both auxiliary controls, or the auxiliary heating is insufficient. |
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| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 | The auxiliary HVAC control module cannot request A/C compressor operation. An A/C request must be generated by the HVAC control module to provide cooled airflow through the auxiliary system. Does the HVAC control module operate and provide sufficient heating? |
- | Go to Step 3 | Go to Too Cold in Vehicle |
| 3 |
|
- | Go to Diagnostic Trouble Code (DTC) List - Vehicle | Go to Step 4 |
| 4 | Place the auxiliary blower motor switch in each speed position. Does the auxiliary blower motor operate in each speed position? |
- | Go to Step 5 | Go to Auxiliary Blower Motor Malfunction |
| 5 | Does the auxiliary blower operate at the desired speed? | - | Go to Step 6 | Go to Auxiliary Blower Motor Malfunction |
| 6 | Does the Too Cold In Vehicle concern occur when heat is desired? | - | Go to Step 7 | Go to Step 8 |
| 7 | Perform the Heating Performance Diagnostic test. Refer to Heating Performance Diagnostic
. Did you find and correct the condition? |
- | Go to Step 19 | Go to Step 8 |
| 8 |
|
-4 to +4 | Go to Step 9 | Go to Step 13 |
| 9 |
|
0-255 Counts | Go to Step 10 | Go to Step 15 |
| 10 | Inspect the auxiliary air temperature sensor for the following conditions:
Did you find and correct the condition? |
- | Go to Step 19 | Go to Step 11 |
| 11 |
|
-3 to +3°C (-5 to +5°F) | Go to Step 19 | Go to Step 12 |
| 12 | Test the temperature sensor resistance. Refer to Sensor Resistance Table table.. Does the resistance measure near the Sensor Resistance Table value? |
- | Go to Step 16 | Go to Step 14 |
| 13 | Inspect for poor connections at the harness connector of the auxiliary 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 19 | Go to Step 17 |
| 14 | Inspect for poor connections at the harness connector of the auxiliary air temperature sensor. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 19 | 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
. Did you find and correct the condition? |
- | Go to Step 19 | Go to Step 18 |
| 16 | Replace the air temperature sensor. Refer to Inside Air Temperature Sensor Assembly Replacement . Did you complete the replacement? |
- | Go to Step 19 | - |
| 17 | Replace the auxiliary HVAC control module. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 19 | - |
| 18 | Replace the HVAC control module. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 19 | - |
| 19 | Operate the system in order to verify the repair. Did you correct the condition? |
- | System OK | Go to Step 2 |