Cooling Fan Testing

ON-VEHICLE INSPECTION
Low Temperature (Below 83°C (181°F))

1. Turn ignition switch "ON".
Check that the cooling fan stops.
If not. check the cooling fan relay and water temperature switch, and check for a separated connector or severed wire between the cooling fan relay and water temperature switch.





2. Disconnect water temperature switch connector.
Check that the cooling fan rotates.
If not, check the cooling fan relay, cooling fan, engine main relay and fuse, and check for a short circuit between the cooling fan relay and water temperature switch.
3. Connect water temperature switch connector.





High Temperature (Above 93°C (199°F))

4. Start engine.
a. Raise coolant temperature to above 93°C (199°F).
b. Check that the cooling fan rotates.
If not, replace the water temperature switch.