Cooling Fan Inoperative (Low Speed Operates in High Speed)
Reference Table
| Symptom | Causes |
|---|---|
| Fan motor inoperative in both speeds |
|
| Fan motor inoperative in high speed only |
|
| Fan motor low speed operates at high speed |
|
| Fan motor inoperative in low speed only | Open or short to B+ in the fan resistor circuit. |
Cooling Fan Inoperative (Low Speed Operates in High Speed)
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Engine Cooling Schematics . Connector End View Reference: Cooling System Connector End Views DEFINITION: The cooling fan motor low speed operates at high speed. |
|||
| 1 | Did you review the Cooling System Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Engine Cooling |
| 2 |
|
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 |
|
Go to Step 8 | Go to Step 4 |
| 4 | Test the fan 2 relay. The relay should be normally open between terminals 3 and 5 and normally closed between terminals 3 and 4. Did the relay test OK? |
Go to Step 5 | Go to Step 9 |
| 5 | Test the fan 2 relay coil control circuits 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 12 | Go to Step 6 |
| 6 | Test the refrigerant pressure switch for a closed condition. The switch should be normally open between terminals 2 and 3. Did the switch test OK? |
Go to Step 7 | Go to Step 10 |
| 7 | Inspect for a poor connection at the harness connector of the Powertrain Control Module (PCM). 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 12 | Go to Step 11 |
| 8 | Repair the short to ground in the fan motor ground circuit. Refer to Circuit Testing
and Wiring Repairs
in Wiring Systems. Did you complete the repair? |
Go to Step 12 | - |
| 9 | Replace the fan 2 relay. Refer to Cooling Fan Relay Replacement . Did you complete the replacement? |
Go to Step 12 | - |
| 10 | Replace the refrigerant pressure switch. Refer to Air Conditioning (A/C) Refrigerant Pressure Sensor Replacement
in Heating,Ventilation and Air Conditioning. Did you complete the replacement? |
Go to Step 12 | - |
| 11 | Replace the PCM. Refer to Powertrain Control Module Programming and Setup
in Programming and Setup. Did you complete the replacement? |
Go to Step 12 | - |
| 12 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 3 |