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Re: Where is cooling fan relay andcooling fan temp switch
The coolant fan relay is located on the Right Hand front of the engine compartment on the relay bracket. Your temp sensor is located on bottom part of radiator. Hope this helps.
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Cooling fan switch ? The cooling fans on your vehicle are computer controlled . Relay's energized by PCM - engine computer . Coolant temp sensor is a input to the PCM ,when the temp. reaches 212 degress the PCM will energize the low speed fan relay ,if temp reaches 250 degress the PCM will energize the high speed cooling fan relay . Hooking up a scan tool an checking coolant temp. sensor data to the PCM and checking control from the PCM ( energizings relay's ) Is how to diagnose this . Not replacing parts and hope you fix the problem . Your best bet take it to a qualified repair shop.
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 .
Cooling fan switch ? The cooling fans (2) on that motor are controlled by three relays . A coolant temp. sensor gives temp info to the PCM - engine computer .
During high speed operation the PCM supplies the ground path for the cooling fan 1 relay through the low speed cooling fan relay control circuit. After a 3 second delay, the PCM supplies a ground path for the cooling fan 2 relay and the cooling fan S/P relay through the high speed cooling fan relay control circuit. This energizes the cooling fan 2 relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the cooling fan S/P relay coil is energized closing the relay contacts and provides battery positive voltage from the cool fan 2 fuse on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.
The PCM commands Low Speed Fans on under the following conditions:
• Engine coolant temperature exceeds approximately 106°C (223°F).
• When A/C is requested and the ambient temperature is more than 50°C (122°F).
• A/C refrigerant pressure exceeds 1 310 kPa (190 psi).
• After the vehicle is shut off if the engine coolant temperature at key-off is more than 140°C (284°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.
The PCM commands High Speed Fans on under the following conditions:
• Engine coolant temperature reaches 110°C (230°F).
• A/C refrigerant pressure exceeds 1 655 kPa (240 psi).
• When certain DTCs set .
Watch this video ,it shows how it works ! Relay Driven Dual Cooling Fan Diagnostics
I'm sorry but I don't have a wiring diagram for that model. However, the corolla diagram may be similar. It shows that both the ac fan relay and the engine radiator fan relay are controlled by grounding through the "water temp switch". In other words, neither fan will work until the engine is warm and the water temp switch is closed. Check out the water temp switch to see if it is stuck open (or stuck in the cold mode.)
Should have a relay for the fan, but typically the coolant temp switch will go bad, not the temp sensor but the switch which is usually located around radiator. Most parts stores carry them & should be able to assist you with the proper location as well.
Cooling fans ( on radiator ) only come on when the engine reaches a certain (hot) temprature. There is a temp sensor threaded into the radiator end reservoir that switches a relay off and on that runs the fans. Either the temp sensor or the relay is probably bad. Normally , those fans will not be on if the car is moving , the air flow from just driving is sufficient to cool the rad. If you stopped and idled for a while , eventually the rad would heat up enough for the fans to come on.
The cooling fan does not come on until the engine temp reaches 229 degrees. it is controlled by a cooling fan relay. Cheeck for power at the fan motor and check the relay. The A/C. If yuor a/c system is low on freon the low pressure switch on the accumulator will not complete the circuit for the clutch. Check the charge, voltage present at the clutch or the low pressure switch. You can install a jumper in place of the switch to test.
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.
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