The numbers below refer to the step numbers on the diagnostic table.
The ambient air temperature must be above 3°C (38°F) for this A/C compressor test.
The specified values are from the A/C System Performance Test.
Step | Action | Values | Yes | No | ||||
---|---|---|---|---|---|---|---|---|
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: The temperature cannot be adjusted, or cooling is insufficient during A/C operation. | ||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||
2 |
Important: All DTCs that are set must be diagnosed first unless you were sent to this diagnostic from a specific DTC diagnostic.
Does the blower motor operate in any speed position? | -- | 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 |
Does the recirculation door move from the recirculation position to the outside air position? | -- | Go to Step 5 | |||||
Important:
Does the A/C compressor operate? | -- | Go to Step 6 | ||||||
Perform the A/C system performance test. Refer to Air Conditioning (A/C) System Performance Test . Did you find and correct the condition? | -- | Go to Step 24 | Go to Step 7 | |||||
7 | Inspect the inside air temperature sensor for proper installation. Refer to Inside Air Temperature Sensor Replacement . Did you find and correct the condition? | -- | Go to Step 24 | Go to Step 8 | ||||
8 |
Does the paper stay in place? | -- | Go to Step 9 | Go to Step 16 | ||||
9 |
Does the scan tool indicate the sensor temperatures is within 3°C (5°F) of the thermometer temperature? | -- | Go to Step 10 | Go to Step 13 | ||||
10 |
Is the Solar Sensor parameter greater than the specified value? | 220 Counts | Go to Step 11 | Go to Step 18 | ||||
11 |
Do the counts change? | -- | Go to Step 12 | Go to Step 18 | ||||
12 | Test the resistance of the ambient air temperature sensor. Refer to Sensor Resistance Table . Is the resistance near the value in the Sensor Resistance Table? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 14 | ||||
13 | Test the resistance of the inside air temperature sensor. Refer to Sensor Resistance Table . Is the resistance near the value in the Sensor Resistance Table? | -- | Go to Step 19 | Go to Step 17 | ||||
14 | Inspect for poor connections at the harness connector of the ambient 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 24 | Go to Step 16 | ||||
15 | Inspect the aspirator tube for an air leak or obstruction. Did you find and correct the condition? | -- | Go to Step 24 | -- | ||||
16 | Inspect for poor connections at the harness connector of the ambient 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 24 | Go to Step 22 | ||||
17 | Inspect for poor connections at the harness connector of the inside 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 24 | Go to Step 20 | ||||
18 | 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 24 | Go to Step 21 | ||||
19 | 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 24 | Go to Step 23 | ||||
20 | Replace the inside air temperature sensor. Refer to Inside Air Temperature Sensor Replacement . Did you complete the replacement? | -- | Go to Step 24 | -- | ||||
21 | Replace the sunload sensor. Refer to Sun Load Sensor Replacement . Did you complete the replacement? | -- | Go to Step 24 | -- | ||||
22 | Replace the ambient air temperature sensor. Refer to Ambient Air Temperature Sensor Replacement . Did you complete the replacement? | -- | Go to Step 24 | -- | ||||
23 | Replace the HVAC control module. Refer to Control Module References for replacement, setup and programming. Did you complete the replacement? | -- | Go to Step 24 | -- | ||||
24 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |