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There should be both. Should have a temperature switch, an A/C switch, a defrost switch that all send signals to the ECU. And there is a fuse and relays in the circuit for the low and high speed fan controls.
The air con fan comes on when the air con is engaged, the engine fan comes on only when the engine reaches operation temp. controlled by a temp. switch. on the block or radiator .
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 .
Hi Dennis, When the AC is selected an additional cooling fan should cut in to cool the additional requirements of the condenser radiator, mounted in front of the radiator cooling the engine. If the operation of the AC fan is intermittent the most probable cause is a defective control relay or a loose connection. The relays are easy to find, being in a housing usually marked on top of the outside. Regards John
Is your radiator cooling fan operating when the A/C is turned on? The cooling fan should be running at all times with the A/C on. If it does not, then your problem is being caused by a bad cooling fan motor, a bad cooling fan relay, a broken fan motor circuit, or broken fan control circuit.
Ok. The way your system is set up,you have a fan switch located in the engine block,usually near the top.That fan swtich sends the voltage to the fan motor or to a fan relay then to the motor.You can jump the fan motor directly to make sure the motor itself is not burned out by unplugging the motor and running a jumper wire from your battery pos terminal to the terminals on the fan motor itself..If you have checked the motor and it does work,then the easiest thing to do is simply replace the fan switch.You should have a Coolant temp switch and a radiator fan switch and possibly and Radiator fan relay.I would try the radiator switch first,then replace the relay.The coolant temp sensor is for the computer and usually doesnt tie into the radiator fan switch.try that and repost.Good luck
check and see if your model have the hydrolic (not electric) coolant fan.If so pay attention to see if the fan is running very slow and never changes speed.If this is the case,check to make sure that the plug to the sensor that is located on back of the powersteering pump has not come loose.They are know to work there way off.If it is not unplugged than the sensor on back of the powersteering pump needs to be replaced.This will allow the proper flow of fluid and pressure to properly operate your fan.This may sound strange,but i buy es300's with this problem often because people are afraid of them and think there is a major problem.This will take only 5 minutes or less of your time.
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