It all depends on how your saloon was built.
Some had the radiator on the engine bay side of the nosecone and some
had it fitted inside the nosecone.
The biggest issue is normally getting the bolts that hold the nosecone
on undone.
You shouldn't really need a manual switch on the fan if everything is
working correctly the fan should go on and off as required.
There are quite a few different temperature fan switches, they have
different body colours I've seen Yellow, Green, Blue, Orange, Brown and
Black.
The brown and black are higher temperature. for the petrol engines, the
other colours seem to be on the Diesels, or on some of the Zetecs when
the switch is mounted in the hose or the radiator and has to compensate
for the heat difference between that and the head.
Here are some numbers i found with Google:
On Off
Orange 103 98
Blue 110 105
Black 103 98
Green 95 88
Yellow 95 90
Yellow 100 95
White 102 97
I'm not sure how accurate these are as they were all from different sources.
I would guess the red section would be around 110C, you normally want
the fan to come on before it gets there.
But, there is a lot of variation, like the fan switch, there are many
different colours of temperature gauge sender, i think they start off
matched to the gauges but as soon the engines get swapped around they no
longer match and the gauges don't read as accurately.
JIm
On 07/02/2020 16:26, Derek Clews wrote:
Dear All,
Need to replace the coupe radiator as it is split. Items available on
ebay and elsewhere.
Looking at the job it looks like you have to remove the nose cone to
replace it. Or do you know of a way to get round that?
While the coolant system is empty I thought I would replace the
thermostat and fan switch and check the wiring as they are relatively
cheap and both seem to give regular trouble over the medium term.
Also thought I should run a manual fan switch for summer traffic
queues peace of mind as well.
The Haynes manual has the spec for the thermostat temperature (opening
85C to 89C) but not the fan switch temperature. I am looking at Lucas
SNB710. The part seems to be the right fan switch and is says from
103C and to 98C which sounds fine but others I found were lower
figures and of doubtful parentage! Can anyone confirm the right
temperatures?
I know the instrument is not very accurate, but what temperature is
the start of the red arc on the top of the ford temp gauge? I now
have an infrared thermometer and can do some proper checking.
Thanks
Derek.
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