Neil I just chopped a fan switch connector out of the loom of the white 2+2
with you in mind. Let me know if you need it.

Escort CVH will also have the same one, it's in the top rad hose

Reading up on the override switch from XR2 owners, they've done it with a 4
pin relay and 10A fuse if that gives you something to work from




Andy

-----Original Message-----
From: [email protected] [mailto:[email protected]]
On Behalf Of barnacle
Sent: 04 July 2009 07:42
To: Quantum Owners Group
Subject: [Quantum Owners] Re: Fan switch connector - Fiesta


I don't believe it's under-bonnet heat, at least directly; I think
it's more to do with twenty-year old connectors not making a good
contact and arcing within the body of the plug. When I got the car the
connector was original and very fragile; I replaced it with one from a
scrapper that looked in somewhat better condition. The system failed a
couple of months ago and testing at the plug indicated it was the
switch which had failed, so I replaced that.

Then yesterday on the way back from work (just half an hour through
rush-hour traffic and a quarter hour up the motorway!) it died again.
Overheating in town but bringing the temperature down once at speed,
as you'd expect if the stat and rad were working properly.  As I was
going to the car shop anyway (battery for the Fiat) I bought a new
switch, swearing slightly... and discovered the connector has
overheated and glued itself to the previous switch. When eventually
removed, there is evidence of arcing on the connector (well, what's
left of it!) and the internal connection to the cable loom is
intermittent and position dependent.

I haven't checked yet to see whether there should be a relay in the
circuit, or if the switch is intended to to manage the fan current
directly, but with my electronic engineer's hat on I'd say this is
evidence of overheating and failure due to excess inductive loads.

It's perhaps significant that I've done as many miles in the last year
or so than the car did in the previous ten...

Neil

On Jul 3, 11:32 pm, Tony Pottrell <[email protected]> wrote:
> Indeed...
>
> I have heard of them melting, but only when the fan is on for an
> extended time.  Is your fan drawing more current than it should?
>
> Andy Haworth wrote:
> > They shouldnt be melting! Although I have had some with slightly fragile
wiring.
>
> > Whats the thermostat like?
>
> > Andy



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