Cooling Fan Inoperative
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Cooling Fan Inoperative
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Engine Cooling Schematics Connector End View Reference: Cooling System Connector End Views DEFINITION: One or both engine coolfan motors do not operate properly 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 |
|
Go to Step 3 | Go to Step 4 |
| 3 | With a scan tool, command the Fan Relays 1, 2 & 3 ON and OFF. Do the high speed engine coolfans turn ON and OFF with each command? |
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 11 |
| 4 |
IMPORTANT:
Do NOT remove the 20-A fused jumper wire connected during this step. Use a second 20-A fused jumper wire while performing the following steps.
|
Go to Step 13 | Go to Step 5 |
| 5 |
|
Go to Step 14 | Go to Step 6 |
| 6 | Connect the second 20-A fused jumper from the battery positive voltage to the coolfan motor supply voltage circuit of the coolfan 3 relay. Does the right coolfan operate in high speed? |
Go to Step 9 | Go to Step 7 |
| 7 |
|
Go to Step 16 | Go to Step 8 |
| 8 | Connect the second 20-Amp fused jumper wire from the coolfan supply voltage circuit of the right coolfan electrical connector to a good ground. Does the left coolfan motor operate in high speed? |
Go to Step 20 | Go to Step 21 |
| 9 |
|
Go to Step 17 | Go to Step 10 |
| 10 | Connect the second 20-Amp fused jumper wire from battery positive voltage to the left coolfan low reference circuit of the left coolfan electrical connector. Does the right coolfan operate in high speed? |
Go to Step 18 | Go to Step 22 |
| 11 | Does the right coolfan operate in high speed? | Go to Step 12 | Go to Step 15 |
| 12 |
|
Go to Step 14 | Go to Step 19 |
| 13 | Inspect for poor connections at the coolfan 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 28 | Go to Step 23 |
| 14 | Inspect for poor connections at the coolfan 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 28 | Go to Step 24 |
| 15 | Inspect for poor connections at the coolfan 2 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 28 | Go to Step 25 |
| 16 | Inspect for poor connections at the harness connector of the right coolfan. 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 28 | Go to Step 26 |
| 17 | Inspect for poor connections at the harness connector of the left coolfan. 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 28 | Go to Step 27 |
| 18 | Repair the left coolfan motor supply voltage circuit. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
Go to Step 28 | - |
| 19 | Repair the left coolfan ground circuit. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
Go to Step 28 | - |
| 20 | Repair the right coolfan ground circuit. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
Go to Step 28 | - |
| 21 | Repair the right coolfan motor supply voltage circuit. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
Go to Step 28 | - |
| 22 | Repair the left coolfan low reference circuit. Refer to Wiring Repairs
in Wiring Systems. Did you complete the repair? |
Go to Step 28 | - |
| 23 | Replace the coolfan 1 relay. Is the repair complete? |
Go to Step 28 | - |
| 24 | Replace the coolfan 3 relay. Is the repair complete? |
Go to Step 28 | - |
| 25 | Replace the coolfan 2 relay. Is the repair complete? |
Go to Step 28 | - |
| 26 | Replace the right coolfan. Refer to Cooling Fan Motor Replacement - Electric . Is the repair complete? |
Go to Step 28 | - |
| 27 | Replace the left coolfan. Refer to Cooling Fan Motor Replacement - Electric . Is the repair complete? |
Go to Step 28 | - |
| 28 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 3 |