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Follow the wiring from the fan motor it should lead you to the heat sensor that is located on your radiator, this sensor swithch as possibly stuck in the closed circuit position that's wye your fan is running constantly as this switch completes the power supply to the fan you can pull the spade clip of the sensor to stop the fan until you get a new switch sensor.
The engine temp sensor sends a signal to the computer and the computer grounds the fan relay when it is needed. I'm showing 6 relays on the firewall under the windshield. The two on the right side are high and low radiator fan relays.
test your fan motor.run b+ and ground to your motor and see if it runs.if it doesnt it is probably your coolant fan switch located on the cylinder head or the coolant fan relay.hope this helps.keep posted.
there is a fan relay, and an AC relay that both turn the fan on at certain times, including when the AC is on. a coolant temp sensor tells the computer (ECM) to turn on the fan but only when the engine reaches a certain temp. an electronic component locator can show you where these sensors and relays are located. they are not very expensive. your local auto parts store can look that up for you.
CHECK COOLING FAN FUSE AND RELAY.IF BOTH GOOD SCAN CAR TO CHECK COOLANT TEMPERATURE SENSOR FAULT CODE.THE PCM AND COOLANT TEMP. SENSOR IS WHAT CAUSE FAN TO RUN AT CERTAIN TEMPERATURE.IF ALL IS GOOD.HOT WIRE COOLING FAN USING JUMPER WIRES TO BATTERY.IF FAN DONT RUN REPLACE FAN MOTOR.IF FAN RUNS YOU HAVE SHORT OR BROKE WIRE IN THE COOLING FAN ELECTRICAL CONNECTOR.
eng.temp.coolant sensor,located on thermostat housing,if u think sensor is defect,this check will make engine light come on,unplug elect. connection on sensor while car is idling,cooling fan will start up within 1 min.if it doesnt check fans power circuit.or apply batt.voltage directly to fan to see if fan will work.
The water temp sensor is located near the thermostat housing. This sensor is what tells the ECM to turn the fan on/off. The water temp sending unit is located near the same area. You know you have the correct sensor is because the water temp sensor has a 2 prong plug. The water temp sending unit only has 1 prong.