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I Supported Toymods
Location:
perth
Registered:
September 2002
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thermo fan problem - all opinions appreciated
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Wed, 19 November 2003 05:52
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Hey ppl, anyone know how the ECU (ae92) controls the thermo fans?
Is there a sensor?
Ever since i removed my air con, as soon as ignition is on ACC, or the car is running, both my thermos come on, 1 blowing onto clutch, and one for radiator i think.
I know for SURE they didnt' used to come on until engine was really hot (40degrees days)
They're fucking loud and annoying and my car is running too cold. Anyone suggest what to fix? maybe sensor has tripped out and it defaults to putting fans on as a safe guard??
Cheers all
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I supported Toymods
Location:
Ademelaide, SA
Registered:
July 2003
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Re: thermo fan problem - all opinions appreciated
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Wed, 19 November 2003 08:13
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on the thermostat housing (on top of the gearbox), there is a couple of plugs, there is one, which is the thermatic switch, and if it earths out, ie. craps itself... the fans will be on 24/7 with the ignition on.
it's the one with only one wire going into it, which from memory is the brown one. it's also around the $90 mark from toyota....
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I Supported Toymods
Location:
perth
Registered:
September 2002
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Re: thermo fan problem - all opinions appreciated
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Wed, 19 November 2003 15:30
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Cheers toyotaboy, ill have a look 
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Location:
sydney
Registered:
March 2003
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Re: thermo fan problem - all opinions appreciated
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Wed, 19 November 2003 21:28
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the sensor doesnt earth out and turn fans on
its always earthed to stop fans from commin on
then it loses the earth asnd turns the fans on
thats y they uses a normally closed relay for the fans
if the wire gets cut or falls of the sensor the fan will come on
so it needs an earth for the fan to stay offf
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Location:
Brisbane
Registered:
July 2002
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Location:
Brisbane
Registered:
July 2002
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Re: thermo fan problem - all opinions appreciated
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Wed, 19 November 2003 22:24
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I'm assuming you have to ground it, otherwise you might have to hold the wire high, ie. +12v.
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Location:
sydney
Registered:
March 2003
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Re: thermo fan problem - all opinions appreciated
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Thu, 20 November 2003 04:19
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yer if the a/c has been played with
if it has lost its gas
the thermo will run
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Registered:
April 2003
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Re: thermo fan problem - all opinions appreciated
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Thu, 20 November 2003 09:23
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sideshow - How would I wire up the thermo to the thermostate so the fans come on when they are suppose to.
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Location:
sydney
Registered:
March 2003
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Re: thermo fan problem - all opinions appreciated
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Thu, 20 November 2003 10:31
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i presume u r using a sensor of a corolla thats otop of gbox
ok u need a relay(normally open) to trigger power to another relay when ignition is on(this other relay is normally closed)
then u have the sensor trigger this normally closed relay to supply the power (coming from the other relay) to the fan
its abit complicated but its the only way to do it so that the fan doesnt turn on when ignition is off
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