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        General >> Problems >> cooling fans on high speed
        
(Message started by: spanners on Jun 1^st, 2011, 7:50pm)

Title: cooling fans on high speed
Post by spanners on Jun 1^st, 2011, 7:50pm

hi all my fans are on high speed all the time, 2.3 scorpio?
was thinking of looking at the sensors by the stat housing. do these have a certain resistence? if so what should they be?
thanks

Title: Re: cooling fans on high speed
Post by PJDavis on Jun 1^st, 2011, 8:41pm

Something to note, if the fans are on all the time it could just simply be a broken wire to the block-sender. I have put an in-line switch into my electric fans by simply breaking the circuit of one of the wires with the switch in the middle. When I turn the switch OFF, this activates both fans full-on.

Peter

Title: Re: cooling fans on high speed
Post by spanners on Jun 1^st, 2011, 9:04pm

thanks peter,
will have a dig about on the wiring side, i read on this site that with auto climate control the two sensors that are next to the stat one of which is a temp control for the fans? unable to find the info now.
thanks for the info it would be easy to fit a switch in so as a fall back i might just do that.

Title: Re: cooling fans on high speed
Post by gozz on Jun 1^st, 2011, 9:06pm

on 06/01/11 at 19:50:42, spanners wrote:

hi all my fans are on high speed all the time, 2.3 scorpio?
was thinking of looking at the sensors by the stat housing. do these have a certain resistence? if so what should they be?
thanks

I've had that trouble when the refrigerant pressure is low.
GOZZ.

Title: Re: cooling fans on high speed
Post by spanners on Jun 1^st, 2011, 9:11pm

ah well the air con pump collapsed so its been bypassed. this problem with the fan heaters was well before this though and the air con was working?

Title: Re: cooling fans on high speed
Post by gozz on Jun 1^st, 2011, 9:44pm

You could try another big green relay in case it's jammed.

Title: Re: cooling fans on high speed
Post by MarkP80 on Jun 23^rd, 2011, 8:46am

Do you have an OBD lead? That will tell you if the PCM is directing the fans to high speed - in which case it would indicate a faulty temperature sensor I think.
If it isn't directing them to high speed then as Gozz suggests, it may be the big green relay is stuck.

I have a couple of useful wiring diagrams/descriptions of the circuits which I could send you if you want to pm me your email address.

Cheers,
MarkP

Title: Re: cooling fans on high speed
Post by Geoff_W on Jun 23^rd, 2011, 8:44pm

Are you talking ventilation fans, or cooling fans on Radiator?
If it is the ventilation fans, try disconnecting a wire to your HBC, if that stops it you may find you have a faulty HBC. I had the problem a couple of weeks ago. With fans off you can still select temperatures and airflow will still give heat or cold. In my case thanks to Stuart at Harewood, I swapped the HBC and everything now works beautifully 8)