Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you review the HVAC operation and perform the necessary inspections? | -- | Go to Step 2 | Go to Symptoms |
2 |
Does the shaft move with every knob step movement? | -- | Go to Step 3 | Go to Step 4 |
3 |
Is the vehicle reaching the normal operating temperature? | -- | Go to Step 5 | Go to Thermostat Diagnosis in Engine Cooling |
4 | Using a test lamp backprobe the temperature control actuator cavity 10 to ground. Does the test lamp illuminate? | -- | Go to Step 6 | Go to Step 7 |
5 | Inspect the temperature control door mechanical condition for binding. Refer to Temperature Actuator Replacement in Heating, Ventilation, and Air Conditioning. Does any binding exist? | -- | Go to Step 16 | Go to Step 17 |
6 |
Does the test lamp illuminate? | -- | Go to Step 8 | Go to Step 9 |
7 | Repair the open in CKT 141 (BRN). Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 18 | -- |
8 |
Does the resistance measure less than the specified value? | 10 ohms | Go to Step 10 | Go to Step 11 |
9 | Repair the open in CKT 1050 (BLK). Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 18 | -- |
10 |
Does the resistance vary within the specified range? | 0-10 Kohms | Go to Step 12 | Go to Step 13 |
11 | Repair the open in CKT 1050 (BLK). Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 18 | -- |
12 | Using an ohmmeter measure the resistance from the control assembly connector C2 CKT 733 (LT BLU) cavity F and the temperature control actuator connector CKT 733 (LT BLU) cavity 8. Does the resistance measure less than the specified value? | 10 ohms | Go to Step 14 | Go to Step 15 |
13 | Replace the control assembly. Refer to Control Assembly Replacement in Heating, Ventilation, and Air Conditioning. Did you complete the replacement? | -- | Go to Step 18 | -- |
14 | Replace the temperature control actuator. Refer to Temperature Actuator Replacement in Heating, Ventilation, and Air Conditioning. Did you complete the replacement? | -- | Go to Step 18 | -- |
15 | Repair the open in CKT 733 (LT BLU). Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 18 | -- |
16 | Repair the cause of the binding. Refer to Floor Air Outlet Replacement - Right Side in Heating, Ventilation, and Air Conditioning. Did you complete the repair? | -- | Go to Step 18 | -- |
17 | Repair restriction in coolant flow. Refer to Thermostat Diagnosis in Engine Cooling. Did you complete the repair? | -- | Go to Step 18 | -- |
18 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
