Cooling Fan Always On
WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
Cooling Fan Always On
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Engine Cooling Schematics Connector End View Reference: Cooling System Connector End Views DEFINITION: One or both engine cooling fan motors run continuously in high or low speed modes. |
|||
| 1 | Did you perform the Engine Cooling Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Engine Cooling |
| 2 | Turn ON the ignition, with the engine OFF. 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 5 | Go to Step 4 |
| 4 | Remove the fan 2 relay. Did the right cooling fan turn OFF? |
Go to Step 8 | Go to Step 6 |
| 5 | Remove the fan 1 relay. Did the cooling fans turn OFF? |
Go to Step 10 | Go to Step 7 |
| 6 | Remove the fan 3 relay. Did the right cooling fan turn OFF? |
Go to Step 11 | Go to Step 9 |
| 7 | 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 14 | - |
| 8 | 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 14 | - |
| 9 | 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 14 | - |
| 10 | Inspect for poor connections at the fan 1 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 14 | Go to Step 12 |
| 11 | Inspect for poor connections at the fan 3 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 14 | Go to Step 13 |
| 12 | Replace the fan 1 relay. Did you complete the replacement? |
Go to Step 14 | - |
| 13 | Replace the fan 3 relay. Did you complete the replacement? |
Go to Step 14 | - |
| 14 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 2 |