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Location:
Sydney
Registered:
October 2003
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Why are my Thermo Fans on??
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Mon, 18 October 2004 10:44
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I just finished my airbox for my car. Then changed my oil, went to start the car, turned it on reds and my thermo fans cranked up. The temp gauge is reaqding dead cold. Whats going on, they are suppose to come on at 90 degrees.
Have I earthed something or what???
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Registered:
May 2004
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Re: Why are my Thermo Fans on??
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Mon, 18 October 2004 11:02
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It is a very high possibilty that you have earthed something out yes.
This is a safety precaution set by the manfaturer, to help prevent overheating in an open circuit, ground or extremely high resistance situation of the sensor to ecu circuit.
Is it possible that you have accidently unplugged something, ripped out some wiring etc when you were fiddling around with your car?
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Toymods Club Treasurer
Location:
Sydney
Registered:
May 2002
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Re: Why are my Thermo Fans on??
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Tue, 19 October 2004 02:31
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Is your air con on? This turns on the fans no matter cold the engine is.
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Location:
Sydney
Registered:
May 2004
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Re: Why are my Thermo Fans on??
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Tue, 19 October 2004 02:33
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replace the temp switch. on my st162 its under the alternator i think.
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Location:
tas
Registered:
June 2002
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Re: Why are my Thermo Fans on??
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Tue, 19 October 2004 03:28
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If the plug on the thermo switch is off and not making contact the fans will stay on until it's plugged back into the thermo switch near the alternator like celica_john said.
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Location:
south east - melbourne
Registered:
March 2004
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Re: Why are my Thermo Fans on??
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Tue, 19 October 2004 03:35
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wtf my soarer has the big fan behind the radiator always on even on idle when the car has been started , how s it supposed to be then
damn
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Location:
Sydney
Registered:
May 2004
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Re: Why are my Thermo Fans on??
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Tue, 19 October 2004 03:36
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yep but if the connection is good the sensor could be faulty.
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Toymods Club Treasurer
Location:
Sydney
Registered:
May 2002
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Re: Why are my Thermo Fans on??
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Tue, 19 October 2004 03:47
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Sounds like a fail safe system in case the sensor screws up, less chance of cooking the engine.
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Location:
Sydney
Registered:
May 2004
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Re: Why are my Thermo Fans on??
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Tue, 19 October 2004 03:55
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I've got a sensor from a wrecker before that kept the thermo fans switched off so maybe its the luck of the draw.
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Location:
tas
Registered:
June 2002
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Re: Why are my Thermo Fans on??
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Tue, 19 October 2004 11:33
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Yeah it's safe design for if the wiring goes bad, fans on all the time. But if the thermo sensor fails, fans never come on like my mums camry, poor engine was cooking it seld for months with no cooling.
It seems the thermo sensor makes a conductive connection to the earth/negative once the coolant reaches a certain temprature, and the fans come on and turn themselvs off again when they get the coolant temprature down.
I took my mums thermo sensor out, cleaned it and put it back in, aswell as getting all the air out of the cooling system.
It's working properly again.
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