Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the HVAC Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check |
2 |
Does the scan tool display any DTCs? | -- | Go to DTC Table | Go to Step 3 |
3 | Did the customer concern occur during A/C mode operation? | -- | Go to Step 4 | Go to Step 10 |
4 |
IMPORTANT: Indicated outside air temperature must be above 16°C (60°F).
Are right and left center panel outlet temperatures similar? | -- | System OK | Go to Step 5 |
5 | Perform the refrigerant system performance test. Refer to System Performance Test . Are low and high side pressures within specification? | -- | Go to Step 6 | |
6 | Check right and left panel temperature sensors for proper installation. Refer to Panel Discharge Sensor Replacement - Left Side and Panel Discharge Sensor Replacement - Right Side . Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 7 |
7 |
Does the scan tool indicate that both the right and left solar sensor parameters are greater than the specified value? | 230 Counts | Go to Step 8 | Go to Step 18 |
8 |
Do the counts change similarly and correspond to the proper side of the sunload sensor? | -- | Go to Step 9 | Go to Step 18 |
9 |
Does the scan tool indicate sensor temperatures near the thermometer temperatures within the specified range? | +3°C (5°F) to -3°C (-5°F) | System OK | Go to Step 16 |
10 |
Is the coolant system full? | -- | Go to Step 11 | Go to Heating Insufficient |
11 |
Are right and left outlet temperatures similar? | -- | System OK | Go to Step 12 |
12 | Check right and left panel and heater temperature sensors for proper installation. Refer to Panel Discharge Sensor Replacement - Left Side , Panel Discharge Sensor Replacement - Right Side and Heater Temperature Sensor Replacement . Did you find and correct the condition? | -- | Go to Step 23 | Go to Step 13 |
13 |
Does the scan tool indicate that both the right and left solar sensor parameters are greater than the specified value? | 230 Counts | Go to Step 14 | Go to Step 18 |
14 |
Do the counts change similarly and correspond to the proper side of the sunload sensor? | -- | Go to Step 15 | Go to Step 18 |
15 |
Does the scan tool indicate sensor temperatures near the thermometer temperatures within the specified range? | +3°C (5°F) to -3°C (-5°F) | System OK | Go to Step 16 |
16 | Inspect for poor connections at the harness connector of the suspect 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 23 | Go to Step 17 |
17 |
Does the resistance measure near the specified value? | -- | Go to Step 19 | Go to Step 21 |
18 | Inspect for proper orientation (installation) and 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 23 | Go to Step 20 |
19 | Inspect for poor connections at the harness connector of the instrument panel 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 23 | Go to Step 22 |
20 | Replace the sunload sensor. Refer to Sunload and Twilight Sentinel Sensor Replacement in Instrument Panel, Gauges and Console. Did you complete the replacement? | -- | Go to Step 23 | -- |
21 | Replace the temperature sensor. Refer to Panel Discharge Sensor Replacement - Left Side , Panel Discharge Sensor Replacement - Right Side or Heater Temperature Sensor Replacement . Did you complete the replacement? | -- | Go to Step 23 | -- |
22 | Replace the instrument panel module. Refer to Instrument Panel Module Replacement . Did you complete the replacement? | -- | Go to Step 23 | -- |
23 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
