Test Description
The step numbers below refer to the step numbers on the diagnostic table.
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This checks for A/C compressor clutch always ON.
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This test is to ensure the cooling system is operating normally.
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The aspirator tube connects to the rear of the HVAC control module. The aspirator tube is used to draw air past the inside air temperature sensor.
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 Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Does the scan tool display any DTC B0165, B0166, B0408, B0418, or B0233? | -- | Go to Step 3 | |
Does the A/C compressor operate? | -- | Go to Step 4 | ||
4 | Place the blower motor switch in each speed position. Does the blower motor operate in any of the speed positions? | -- | Go to Step 5 | Go to Blower Motor Inoperative |
5 | Does the blower motor operate in the desired speeds? | -- | Go to Step 6 | Go to Blower Motor Malfunction |
6 |
Does the recirculation door operate properly? | -- | Go to Step 7 | |
Perform the heater performance diagnostic. Refer to Heating Performance Diagnostic. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 8 | |
8 |
Do the counts change when the actuators are commanded? | -- | Go to Step 9 | Go to Step 13 |
9 |
Does the scan tool indicate the sensor temperature are within 3°C (5°F) of the thermometer temperatures? | -- | Go to Step 11 | Go to Step 10 |
Inspect for a blocked aspirator tube of the HVAC control module. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 17 | |
11 |
Does the scan tool indicate that the Sunload Sensor parameter is greater than the specified value? | 230 Counts | Go to Step 12 | Go to Step 16 |
12 |
Does the voltage change? | -- | System OK | Go to Step 16 |
13 | Test the suspect actuator door control circuit for a short to voltage, a short to ground, an open, or high resistance. Refer to Circuit Testing and Connector Repairs. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 14 |
14 | Test the suspect actuator ignition 3 voltage circuit for a short to ground, an open, or high resistance. Refer to Circuit Testing and Connector Repairs. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 15 |
15 | Inspect for poor connections at the harness connector of the suspect air temperature actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 19 |
16 | Inspect for poor connections at the harness connector of the sunload sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the condition? | -- | Go to Step 21 | Go to Step 18 |
17 | 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 21 | Go to Step 20 |
18 | Replace the sunload sensor. Refer to Sun Load Sensor Replacement. Did you complete the replacement? | -- | Go to Step 21 | -- |
19 |
Important: Perform the recalibration procedure for the air temperature actuator Replace the suspect air temperature actuator. Refer to Temperature Valve Actuator Replacement - Right Side or Temperature Valve Actuator Replacement - Left Side. Did you complete the replacement? | -- | Go to Step 21 | -- |
20 | Replace the HVAC control module. Refer to Control Module References. Did you complete the replacement? | -- | Go to Step 21 | -- |
21 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
