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Author Topic: Fans on constantly  (Read 721 times)

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JamesV6CDX

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Fans on constantly
« on: 10 February 2010, 13:46:51 »
Hi Guys

My front rad fans are on constantly - at full chat. They only go off when the climate is switched off, (or to eco).

I'm presuming their speed is temperature controlled?

Last night, I did a 30 mile run and the top hose only just felt luke warm. I turned the fans off, and it soon heated up.

Any pointers?  :y
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Kevin Wood

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Re: Fans on constantly
« Reply #1 on: 10 February 2010, 14:17:05 »
Sounds like it could be a stuck fan switch, air con pressure switch or a duff relay. Do the fans behave normally without the climate on? I.E. stay off until temperature into the 90's then come on first stage?

What is the engine running temperature? Top hose temperature shouldn't be dependant on fans, TBH (bottom hose is a different matter).

Kevin
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Marks DTM Calib

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Re: Fans on constantly
« Reply #2 on: 10 February 2010, 14:33:24 »
Front fans should be on when ever the aircon operates
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JamesV6CDX

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Re: Fans on constantly
« Reply #3 on: 10 February 2010, 14:36:16 »
Quote
Front fans should be on when ever the aircon operates

It appears all the fans are on mark - incl the rear rad one? (even first thing on a cold morning) when the aircon is on.  :-/
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Bionic

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Re: Fans on constantly
« Reply #4 on: 10 February 2010, 15:05:48 »
3 fans on mine. two in front are on when the aircon/climate is on and the single rear one is temp switch controlled by coolant temp.
GudLuk
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Kevin Wood

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Re: Fans on constantly
« Reply #5 on: 10 February 2010, 15:28:59 »
Quote
Quote
Front fans should be on when ever the aircon operates

It appears all the fans are on mark - incl the rear rad one? (even first thing on a cold morning) when the aircon is on.  :-/

Sounds like the second stage aircon switch is shorted if they are all on flat out (as opposed to just the front two at half speed, which is normal, as said).

Kevin
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JamesV6CDX

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Re: Fans on constantly
« Reply #6 on: 10 February 2010, 15:33:11 »
Where is that located Kev, any idea?  :y
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Kevin Wood

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Re: Fans on constantly
« Reply #7 on: 10 February 2010, 17:21:31 »
Quote
Where is that located Kev, any idea?  :y

Don't know off the top of my head.  :-/

I'll have a look later.

Kevin
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ians

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Re: Fans on constantly
« Reply #8 on: 10 February 2010, 17:44:55 »
Someone - I think Richard A (but maybe wrong) sent me a guide (one page pdf doc) for diagnosing fan/switch problems.   Maybe worth a pm?   (I may have it on my home PC but not here)
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