Cooling Fan Always On L61
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Engine Cooling Schematics Connector End View Reference: Cooling System Connector End Views DEFINITION: The engine cooling fan motor runs continuously in high or low speed. | |||
1 | Did you perform the Engine Cooling Diagnostic System Check? | Go to Step 2 | |
2 | Turn the ignition ON, with the engine OFF. Is the cooling fan operating at low speed? | Go to Step 4 | Go to Step 3 |
3 | Is the cooling fan operating at high speed? | Go to Step 5 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
4 | Remove the cool fan low relay. Did the fan turn OFF? | Go to Step 7 | Go to Step 6 |
5 | Remove the cool fan high relay. Did the cooling fan turn OFF? | Go to Step 8 | Go to Step 6 |
6 | Repair the cooling fan motor supply voltage circuit for a short to voltage. Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | -- |
7 | Inspect for poor connections at the cool fan low relay. 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 11 | Go to Step 9 |
8 | Inspect for poor connections at the cool fan high relay. 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 11 | Go to Step 10 |
9 | Replace the cool fan low relay. Did you complete the replacement? | Go to Step 11 | -- |
10 | Replace the cool fan high relay. Did you complete the replacement? | Go to Step 11 | -- |
11 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
Cooling Fan Always On L66
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Engine Cooling Schematics , HVAC Schematics in HVAC Manual Connector End View Reference: Cooling System Connector End Views DEFINITION: One or both engine cooling fan motors run continuously in high or low speed. | |||
1 | Did you perform the Engine Cooling Diagnostic System Check? | Go to Step 2 | |
2 |
Are one or both cooling fans ON? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
3 | Are both cooling fans running continuously? | Go to Step 4 | Go to Step 6 |
4 | Are both cooling fans running continuously in high speed? | Go to Step 5 | Go to Step 7 |
5 | Test the low reference circuit of the A/C refrigerant pressure sensor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 18 | Go to Step 14 |
6 | Remove the cool fan 3 relay. Did the right cooling fan turn OFF? | Go to Step 10 | Go to Step 8 |
7 | Remove the cool fan 1 relay. Did the cooling fans turn OFF? | Go to Step 12 | Go to Step 9 |
8 | Remove the cool fan 2 relay. Did the right cooling fan turn OFF? | Go to Step 13 | Go to Step 11 |
9 | Repair the short to voltage in the left cooling fan motor supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 18 | -- |
10 | Repair the short to voltage in the left cooling fan low reference circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 18 | -- |
11 | Repair the short to voltage in the right cooling fan motor supply voltage circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 18 | -- |
12 | Inspect for poor connections at the cool fan 1 relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Repairs. Did you find and correct the condition? | Go to Step 18 | Go to Step 15 |
13 | Inspect for poor connections at the cool fan 2 relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Repairs. Did you find and correct the condition? | Go to Step 18 | Go to Step 16 |
14 | Inspect for poor connections at the A/C refrigerant pressure sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Repairs. Did you find and correct the condition? | Go to Step 18 | Go to Step 17 |
15 | Replace the cool fan 1 relay. Did you complete the replacement? | Go to Step 18 | -- |
16 | Replace the cool fan 2 relay. Did you complete the replacement? | Go to Step 18 | -- |
17 | Replace the A/C refrigerant pressure sensor. Refer to Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement . Did you complete the replacement? | 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 |
