Cooling fan on all time

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CHARLES REAR - 18 Oct 2007 14:32 GMT

I have a 52 reg 1.6 focus.
I have just noticed that the cooling fans come on as soon as I start from
cold, and stay on until I switch off the engine. I thought maybe one or both
the relays had stuck on, but I've checked them with a meter and that is not
the case. The temperature gauge is showing normal all the time once it warms
up. I'm hoping it's not the ECU as I believe that is costly to replace. Is
it a common fault, has anyone any advice please?
Ed

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Mike Hunter - 18 Oct 2007 14:52 GMT

Are you sure you are not operating your HVAC system in the defrost mode?

mike

>I have a 52 reg 1.6 focus.
> I have just noticed that the cooling fans come on as soon as I start from
[quoted text clipped - 4 lines]
> replace. Is it a common fault, has anyone any advice please?
> Ed

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Alan - 18 Oct 2007 16:50 GMT

>I have a 52 reg 1.6 focus.
>I have just noticed that the cooling fans come on as soon as I start from
[quoted text clipped - 3 lines]
>up. I'm hoping it's not the ECU as I believe that is costly to replace. Is
>it a common fault, has anyone any advice please?

One or both fans?

One of the fans is associated with the air conditioning. The air
conditioning comes on automatically if you adjust the heater/blower
controls to direct air at the windscreen - its used to remove moisture
from the incoming air stream On my 2001 UK model the green LED in the
switch doesn't come on when operating in this mode although the A/C is
actually on

Signature

Alan
news2006 {at} amac {dot} f2s {dot} com

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CHARLES REAR - 18 Oct 2007 17:21 GMT

>>I have a 52 reg 1.6 focus.
>>I have just noticed that the cooling fans come on as soon as I start from
[quoted text clipped - 15 lines]
> switch doesn't come on when operating in this mode although the A/C is
> actually on

Thanks so much guys, especially Alan for the full explanation. I had been
having the airflow set to demist lately, I just went out to try it and it's
OK now. Sigh of relief!
I couldn't find anything in the handbook or Haynes manual about it. Thank
god for this ng.
Ed

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Jorgen Moquist - 18 Oct 2007 22:20 GMT

>> I have a 52 reg 1.6 focus.
>> I have just noticed that the cooling fans come on as soon as I start from
[quoted text clipped - 16 lines]
> switch doesn't come on when operating in this mode although the A/C is
> actually on

great, thanks for the explanation.
i was confused, by the using the heater it raised my fuelcomsuption ~5%.
and it is the demoisturing turning the AC on.
/Jorgen

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