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Location:
Fraser Coast, QLD
Registered:
June 2005
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st165 probs. thermo fans wont come on...
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Mon, 17 October 2005 10:02
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My thermo fans wont start up as stated above. I wired it up to switch in the cab and all that so i can manually switch it off and on when i like.
Only thing is im worried that one day ill forget and cook it.
Where is the thermo fan switch sensor located on the engine? Is it on the water return hosing that faces the same direction as the gearbox? Ie single wire greenish?
Is there anyway i can test the switch?
I hav checked the fan relay in the black box and it was fine.
Any ideas guys?
thanks
ty
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Location:
Brisbane
Registered:
June 2003
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Re: st165 probs. thermo fans wont come on...
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Mon, 17 October 2005 10:14
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its a single wired plug switch in the thermostat housing. Same one is used on sv21 camrys, st162 celicas etc.90" on 86 off.
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Location:
Fraser Coast, QLD
Registered:
June 2005
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Re: st165 probs. thermo fans wont come on...
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Mon, 17 October 2005 10:18
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Its different to st162 3sge. Its on the thermostat housing rite? This doesnt hav it there. But has a single wire plug on the housing that comes off the end of the #4 cylinder.
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Location:
Brisbane
Registered:
June 2003
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Re: st165 probs. thermo fans wont come on...
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Mon, 17 October 2005 10:20
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get me a picture of the thermostat housing where the top rad hose is. Then we can think about helping you further 
either that or it is in the bottom radiator tank? i know some st205's had it there.
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Location:
Fraser Coast, QLD
Registered:
June 2005
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Re: st165 probs. thermo fans wont come on...
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Mon, 17 October 2005 10:26
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It does hav a plug in the bottom of the radiator tank. Btw the bottom hose connects to the thermostat housing.
Cant get any pics atm has its pissing down rain
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Location:
Brisbane
Registered:
June 2003
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Re: st165 probs. thermo fans wont come on...
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Mon, 17 October 2005 10:28
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that would be the switch. And im guessing it has failed. what you can do to test it (providing you havent mucked up its wiring) - if you turn the car on, and unplug the switch, by toyota default the fans should come on. if they dont, you have either dodgy wiring or a rooted switch.
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Location:
Fraser Coast, QLD
Registered:
June 2005
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Re: st165 probs. thermo fans wont come on...
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Mon, 17 October 2005 10:48
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I just had a look then to double check. Yeh it has a double wire plug goin to the bottom of the radiator tank. And has nothing on the thermostat housing.
Thanks ill try that and c how it goes.
ty
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Location:
Fraser Coast, QLD
Registered:
June 2005
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Re: st165 probs. thermo fans wont come on...
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Mon, 17 October 2005 11:02
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I unplugged the plug at the bottom off the radiator. It made no difference.could it b the other plug (yellow wit green stripe) where the top hose connects to?
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Location:
Sydney / NSW
Registered:
March 2004
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Re: st165 probs. thermo fans wont come on...
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Mon, 17 October 2005 14:14
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if the thermostat wasnt working the fans would be on constantly. check the fan relays and fuses too see if they are OK, I would be almost sure that is your problem.
Karl
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