For 1990-2009 cars

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.
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | Turn ON the ignition, with the engine OFF. Are both cooling fans operating at low speed? | Go to Step 4 | Go to Step 3
3 | Is the left cooling fan operating at high speed? | Go to Step 5 | Go to Testing for Intermittent Conditions and Poor Connections
4 | Remove the low speed fan relay. Did the fans turn OFF? | Go to Step 8 | Go to Step 6
5 | Remove the high speed fan relay. Did the left cooling fan turn OFF? | Go to Step 9 | Go to Step 7
6 | Repair the cooling fan motor supply voltage circuit of the right cooling fan for a short to voltage. Refer to Wiring Repairs. Did you complete the repair? | Go to Step 12 | --
7 | Repair the cooling fan motor supply voltage circuit of the left cooling fan for a short to voltage. Refer to Wiring Repairs . Did you complete the repairs? | Go to Step 12 | --
8 | Inspect for poor connections at the low speed fan relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs. Did you find and correct the problem? | Go to Step 12 | Go to Step 10
9 | Inspect the high speed cooling fan relay for poor connections. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the problem? | Go to Step 12 | Go to Step 11
10 | Replace the low speed fan relay. Did you complete the replacement? | Go to Step 12 | --
11 | Replace the high speed fan relay. Did you complete the replacement? | Go to Step 12 | --
12 | Operate the system in order to verify the repair. Did you correct the problem? | System OK | Go to Step 2