Cooling Fan Always On
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. 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 , HVAC Schematics
, HVAC 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. |
|||
| 1 | Did you perform the Diagnostic System Check - Engine Cooling ? | 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 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 or S/P 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 |