The Coolant temp Sensor is located right under the top radiator hose (on the engine side), with a little black connector!, You might have to remove th etop hose to get to it with a deep socket and extension!.
Also Dont Forget to blled the coolant system by the bleeder valve uptop right near/above the coolant sensor!.(10MM Mini socket w/ extension IIRC!)
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radiator fan switch ???? has relays ,high speed cooling fan relay an engine cooling fan relay an a cooling fan resistor . A coolant temp. sensor . The temp sensor is a input to the PCM - engine computer ,when temp gets to hot the PCM energizes the relays . There is no radiator fan switch . Videos on youtube .
http://www.bbbind.com/free_tsb.html check out wiring diagram here .
temp switch on the radiator controls the fans. its screwed into the radiator and has a plug on it this turns the fans on when at the right temp to cool down. also there is a fuse just for this in engine bay fuse box.
sensor on my nissan sentra was located on the engine,, coolant temp sensor, there are two of them one for the temp gauge and one for the fan... this info may not be relivant to your car, not sure good luck with it
The radiator cooling fans are controlled by the engine managment computer, it uses the signal from the Engine Coolant Temperature Sensor (ECT), unless the engine is hard starting or runs poorly the sensor is not the problem. Also the Check Engine light would be on, is that the case?
actually, the ECM directing the sensor to actuate the switches. the engine thermostat is the actuator of the fans in the cooling system. and its located in the oulet port of the engine where the upper radiator hose is connected. (and or at the lower rad hose, some design on VWs).
Does the fan operate? If not you fan temp switch may be inoperative. The fan temp switch is mounted in the radiator monitoring the temperature of the coolant. When the temperature rises to a predetermined value the fan should start to assist in cooling down the engine. An easy way to trouble shoot the problem is to disconnect the temp switch wiring, install a jumper wire between the two terminals. If the fan runs then your temp switch is defective. If the fan does not run your fan is the problem. Another possibility is that your fan bearing is bad causing the fan to run slower than it is suppose to.
Look along the radiator hose where it enters the engine. This controls the water temperature.
Toyota Celica Thermal Fan Switch
The Toyota Celica thermal radiator fan switch is usually located in the radiator or the engine block and has 2 or 3 wires coming from the unit. The 3 wire switch has a dual sensor for dual speed radiator fans. The Toyota Celica thermo fan switches come in the factory temperature settings and also come in cooler thermostatic settings so the fan will come on at a lower coolant temp.
The Toyota Celica cooling system is made of aluminum components and requires a Phosphate free coolant. DO NOT PUT an over the counter antifreeze in your Toyota Celica, as it will ruin the radiator and water pump.