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 actually fan constantly on with key

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aaronp
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Home City : Hastings
Registration date : 2017-03-02

PostSubject: actually fan constantly on with key    Thu Mar 16, 2017 7:09 am

Replaced relay that was making a loud flickering sound behind glove box, still same, has brand new radiator in . Doesn't over heat but I want that fan not to be constantly on. Any help be great . Cheers
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TwentyOneThirtyFive
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Number of posts : 210
Home City : Hertfordshire, UK
Model and year : Super GL Camper (Vantech), 2.8D 4wd, 1995
Registration date : 2016-08-04

PostSubject: Re: actually fan constantly on with key    Thu Mar 16, 2017 7:36 am

Assuming you are meaning the radiator fan.

Not sure what engine you have, but certainly for the 2L and 3L the big fan behind the radiator will always turn.  

As the engine gets hotter the fan speed will increase.  It's a viscous system that reacts to heat, not an electrical system. Powered off the alternator and waterpump belts.

hth
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Hiace4wd
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Number of posts : 532
Home City : Netherlands
Model and year : 1994 Toyota Hiace 4x4 DIY camper
Registration date : 2016-02-01

PostSubject: Re: actually fan constantly on with key    Thu Mar 16, 2017 8:27 am

If it is a second electric fan on a second radiator (I read this in other topics) it would very likely be a thermoswitch that is broken, or broken wiring between thermoswitch and electric fan.
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GPW
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Number of posts : 519
Home City : Cambridge, UK
Model and year : Model: KD-KZH100G-MRPGT
Year: 1996
Colour: 4K1
Trim: FN42

Registration date : 2016-07-16

PostSubject: Re: actually fan constantly on with key    Thu Mar 16, 2017 8:45 am

Is the new relay the correct type?
As said, investigate thermo switch and simulate it opening and closing to see if the fan response is correct, as dictated by the relay.
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aaronp
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PostSubject: Re: actually fan constantly on with key    Thu Mar 16, 2017 9:13 pm

I have found a thermo switch under the radiator cap that doesn't have a plug connected to it . Can't find a wire to plug it in either. Any ideas ?
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GPW
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Number of posts : 519
Home City : Cambridge, UK
Model and year : Model: KD-KZH100G-MRPGT
Year: 1996
Colour: 4K1
Trim: FN42

Registration date : 2016-07-16

PostSubject: Re: actually fan constantly on with key    Fri Mar 17, 2017 8:39 am

aaronp wrote:
I have found a thermo switch under the radiator cap that doesn't have a plug connected to it . Can't find a wire to plug it in either. Any ideas ?

Could you add the Model and Year of your van to your profile?
That way it will always appear on the left of your posts so we can see if we have the same van, and therefore know the answer.

The actual Toyota model number would be useful too if you found it under the passenger seat carpet next to the engine.
Like in my profile.
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