I like a good mystery as much as the next guy but I find this
flipping ridiculous.
For a facelift XJS with 4.0L AJ6 engine, does anyone actually
know the temp that the thermostatic switch in the radiator
should turn on the electric fan? I have looked everywhere for
this info but no luck. My repair manual mentions that the
switch will turn the fan off at 90C (194F) but there is no
mention about when it will turn it on. This bugged me
So I started digging on the internet, first locating the
Jaguar part number DAC6794. I called around to all my go to
suppliers here in the US, Motorcars Ltd, Coventry West etc etc
but no-one has the part and hasn’t had it for a long time. So
I go to the Jag Classic Parts site in the UK and it says not
available, contact us. So I duly filled in the request form
and sent it off, receiving a reply the next day to say it’s
not available but they might have it in a month or two. Ok, so
I sent back an email asking for the temp spec of the switch.
The reply was, ‘‘sorry we don’t have that info’’
So I turned to some of the big chain parts suppliers, NAPA,
Autozone etc. They all show the switch on their sites with
prices ranging from $50-$100 but no specs. So I call all of
them and they say sorry part not available and they have no
info about the temp range!!
OK, so now I’m getting very curious and noting some of the
manufacturer names, I gave calls to Standard Motor Products,
BWD Intermotor and Wells Vehicle Electronics who all
purportedly manufacture the switch. I spoke with folks in
their tech departments and they ALL said the same
thing… Sorry part not available, sorry we don’t know
the spec and then they all said ‘‘we actually don’t make that
part it’s an OE’’. One particularly diligent chap at Standard
investigated for a few hours and then called me back to say
sorry no more info.
I find this very odd, I can’t think of any temp measuring
device in the car that doesn’t have a stated range, why would
this be any different?
I can take a guess on when it should come on but I want to
KNOW. I do know that my thermostat will start to open at 88C
(190F) and will be fully open by max 96C (207F), so I would
think that the fan would not come on till it got a bit higher
but when?
There have been many posts on this forum about high reading
temp gauges and cooling fans that either stay on all the time
or don’t appear to work at all, so it seems especially
important to know what’s what.
My fan works fine when I jump the switch so I know my circuit
is good. I haven’t been able to get the engine hotter than
about 96C (207F), which is a good thing , so I don’t expect
the fan come on but I want to know when it will.
Yes I know that I could take the switch out and try to suspend
it in some boiling antifreeze to test it but I shouldn’t have
to!!
Jovial rant over, enquiring minds want to know
Cheers,
Allan–
1994 XJS 4.0 2+2 Convertible 5 Speed Manual
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
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