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 | Place the blower motor switch in each speed position. Does blower motor work in any speed position? | -- | Go to Step 3 | Go to Blower Motor Malfunction |
3 | Does blower motor run in the desired speed position? | -- | 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 |
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 . 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 |
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 | 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 . Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 17 |
16 | Inspect the aspirator tube for an 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 . 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 . 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 . 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 . 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 . Have you finished the replacement? | -- | Go to Step 25 | -- |
22 | Replace the sunload sensor. Refer to Sun Load Sensor Replacement . Have you finished the replacement? | -- | Go to Step 25 | -- |
23 | Replace the ambient air temperature sensor. Refer to Ambient Air Temperature Sensor Replacement . Have you finished the replacement? | -- | Go to Step 25 | -- |
24 | Replace the HVAC control module. Refer to Control Module References for replacement, setup, and programming. Have you finished the replacement? | -- | Go to Step 25 | -- |
25 | Operate the system to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |