Test Description
The numbers below refer to the step numbers on the diagnostic table.
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The ambient air temperature must be above 3°C (38°F) for this A/C compressor test.
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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 HVAC Diagnostic System Check? | -- | Go to Step 2 | |
2 | Place the blower motor switch in each speed position. 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 | |
5 | Does the customer concern occur when the air conditioning is ON? | -- | Go to Step 6 | Go to Step 8 |
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Important: The ambient air temperature must be above 3°C (38°F).
Does the A/C compressor operate? | -- | Go to Step 7 | ||
Perform the A/C system performance test. Refer to Air Conditioning (A/C) System Performance Test in Heating, Ventilation, and Air Conditioning. Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 8 | |
8 | 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 25 | Go to Step 9 |
9 | Turn ON the ignition with the engine OFF. Place the mode switch in panel position. Place the blower motor switch in maximum speed position. Inspect for airflow through the inside air temperature sensor by placing a 5 cm (2 in) square piece of paper over the sensor air inlet. Does the paper stay in place? | -- | Go to Step 10 | Go to Step 16 |
10 |
Does the scan tool indicate the sensor temperatures is within 3°C (5°F) of the thermometer temperature? | -- | Go to Step 11 | Go to Step 14 |
11 |
Is the Solar Sensor parameter greater than the specified value? | 220 Counts | Go to Step 12 | Go to Step 19 |
12 |
Do the counts change? | -- | Go to Step 13 | Go to Step 19 |
13 | 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 in Wiring Systems | Go to Step 15 |
14 | 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 20 | Go to Step 18 |
15 | 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 in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 17 |
16 | Inspect the aspirator tube for a air leak or obstruction. Did you find and correct the condition? | -- | Go to Step 25 | -- |
17 | 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 in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 23 |
18 | 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 in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 21 |
19 | Inspect for poor connections at the harness connector of the sunload sensor. 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 25 | Go to Step 22 |
20 | 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 25 | Go to Step 24 |
21 | Replace the inside air temperature sensor. Refer to Inside Air Temperature Sensor Replacement . Did you complete the replacement? | -- | Go to Step 25 | -- |
22 | Replace the sunload sensor. Refer to Sun Load Sensor Replacement . Did you complete the replacement? | -- | Go to Step 25 | -- |
23 | Replace the ambient air temperature sensor. Refer to Ambient Air Temperature Sensor Replacement . Did you complete the replacement? | -- | Go to Step 25 | -- |
24 | Replace the HVAC Control Module. Refer to HVAC Control Module Replacement . Did you complete the replacement? | -- | Go to Step 25 | -- |
25 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
