Cooling Fan Always On Low Speed
| Table 1: | Reference Table |
Symptom | Causes | ||||
|---|---|---|---|---|---|
Fan motor always on in high speed |
| ||||
Fan motor always on in low speed |
|
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Engine Cooling Schematics Connector End View Reference: Cooling System Connector End Views DEFINITION: The cooling fan motors are always on in low speed. | |||
1 | Did you review the Cooling System Description and Operation and perform the necessary inspections? | Go to Step 2 | |
2 | Turn ON the ignition switch with the engine OFF. Are the fan motors running continuously? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
3 | Remove the fan 1 relay from the underhood fuse block. Are the fan motors running continuously? | Go to Step 4 | Go to Step 5 |
4 | Repair the short to ground in the fan motor low speed ground circuit between the fan motors and the fan 1 relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | -- |
5 | Test the fan 1 relay coil control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | Go to Step 6 |
6 | Replace the fan 1 relay. Refer to Cooling Fan Relay Replacement . Did you complete the replacement? | Go to Step 7 | -- |
7 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
Cooling Fan Always On High Speed
| Table 1: | Reference Table |
Symptom | Causes | ||||
|---|---|---|---|---|---|
Fan motor always on in high speed |
| ||||
Fan motor always on in low speed |
|
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Engine Cooling Schematics Connector End View Reference: Cooling System Connector End Views DEFINITION: The cooling fan motors are always on in high speed. | |||
1 | Did you review the Cooling System Description and Operation and perform the necessary inspections? | Go to Step 2 | |
2 | Turn ON the ignition switch with the engine OFF. Are the fan motors running continuously? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
3 | Remove the fan 2 relay from the underhood fuse block. Are the fan motors running continuously? | Go to Step 4 | Go to Step 5 |
4 | Repair the short to ground in the fan motor high speed ground circuit between the fan motors and the fan 2 relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | -- |
5 | Test the fan 2 relay coil control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 7 | Go to Step 6 |
6 | Replace the fan 2 relay. Refer to Cooling Fan Relay Replacement . Did you complete the replacement? | Go to Step 7 | -- |
7 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
