Radiator Cooling Fan Motor: Testing and Inspection

ELECTRIC COOLING FAN COMPONENTS






ON-VEHICLE INSPECTION
Low Temperature (Below 83°C (181°F)
1. TURN IGNITION SWITCH "ON"
Check that the fan stops
If it does not, check the cooling fan relay and water teperature switch, and check for a separated connector or severed wire between the cooling fan relay and water ternperature switch.






2. DISCONNECT WATER TEMPERATURE SWITCH CONNECTOR
Check that fan rotates.
If not, check the cooling fan relay, fan motor, 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 fan rotates.
If not, replace the water temperature switch.






INSPECTION OF ELECTRIC COOLING FAN COMPONENTS
1. INSPECT WATER TEMPERATURE SWITCH
LOCATION: On the water inlet housing.
(a) Using an ohmmeter, check that there is no continuity between the terminal and body when the coolant temperature is above 93°C (199°F).
(b) Check that there is continuity between the terminal and body when the coolant temperature is below 83°C (181°F).
GIf continuity is not as specified, replace the switch.






2. INSPECT COOLING FAN RELAY
LOCATION: In the engine compartment relay box.






A. Inspect relay continuity
(a) Using an ohmmeter, check that there is continuity between terminals 1 and 2.
(b) Check that there is continuity between terminals 3 and 4.If continuity is not as specified, replace the relay.






B. Inspect relay operation
(a) Apply battery voltage across terminal 1 and 2
(b) Using an ohmmeter, check that there is no continuity between terminals 3 and 4.
If operation is not as specified, replace the relay.
3. INSPECT ENGINE MAIN RELAY






4. INSPECT COOLING FAN MOTOR
(a) Connect battery and ammeter to the fan motor connector.
(b) Check that the fan motor rotates smoothly, and check the reading on the ammeter.
Standard amperage: M/T 3.2 - 4.4 A
A/T 5.8 - 7.4A