running hot

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geepeetee - 02 Jul 2006 21:35 GMT

Hi

Our open classic doesn't like the warm weather. Its had a couple of mammoth
runs recently and is getting very close to the red.

Over the past months its had new rad, thermostat and cap. The electric fan
(even at this temperature) still hasn't cut in, is this normal?.

Are the switches prone to failure, are they readily available.

I have thought about just having it running all the time (it works when the
switch is shorted out) are there any potential prblems to doing this just
in the warm weather.

thanks

Gary

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$ - 02 Jul 2006 23:50 GMT

It could be the fan temp sender - check it's resistance. A friend wired his
in with a relay coming off the sidelight circuit. If you're using those
antifreezes which dont need mixing then I find they run hotter, even my two
stroke 350LC ran hot with that stuff. Back to h2o and antifreeze mix and
things calmed down.

Other than that check the w/pump belt is tensioned ok, they slip if they get
wet too.

Chri$

> Hi
>
[quoted text clipped - 16 lines]
>
> Gary

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Taffy - 03 Jul 2006 01:05 GMT

Well I know the electric auxilliary fan on my 90' Mainstream Cooper
only ever kicks in when it's sitting in heavy traffic on a scorchingly
hot day. So that's not very often in Britain! Oh and the temp. gauge
would be very close to red at that point too!

But the fan on mine is the bolt on type, where as you have the one
built into the inner wing, but as you've already proven it works by
connecting the 2 spades mounted at the base of the radiator together
with a paper clip (or whatever), then that fan should kick in before
the radiator boils over.

So don't worry unless you actually see steam coming out the sides.

Taffy

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Fitzy - 03 Jul 2006 10:37 GMT

Hi People,
I hate to be a killjoy,
have you considered the head gasket,
I have found that most A series engines, need a head gasket when they have
done 60 to 80K miles,
we tend to dismiss the headgasket and change everything else first,
Worth changing is yours falls in this category,
Fitzy

> Well I know the electric auxilliary fan on my 90' Mainstream Cooper
> only ever kicks in when it's sitting in heavy traffic on a scorchingly
[quoted text clipped - 10 lines]
>
> Taffy

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Taffy - 03 Jul 2006 14:24 GMT

Well mine's still on it's original and it's gone around the clock! Oh
god you have me worried now Fitzy! ;O)

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Fitzy - 03 Jul 2006 20:36 GMT

> Well mine's still on it's original and it's gone around the clock! Oh
> god you have me worried now Fitzy! ;O)

Lets face it Taffy,
eventually its going to need a head gasket,
don't wait for it to go,
2-3 hours taking your time should sort it out, and give you piece of mind
we learn to live with a slight overheating problem, and put it down to "the
summer" or the radiator, or even the thermostat,
but its ok in the winter,, how many times have we heard people saying
exactly this,
when I was employed by a main dealer, we had a schedule at 100,000 miles to
remove cylinder heads (at customers expense) and examine the cylinders for
wear etc,
we never found any wear on any of the engines, and proceeded to rebuild
using a new head gasket,,,,,,,,,,WELL THERE'S A SHOCK..........some one
doesn't want to advertise that our engines need a HG at or around 100K,
most manufacturers suffered with the same fault back in the 70s and 80s
but to be fare, modern engines have better components and do a much higher
mileage without any major surgery,
sorry for rambling on
Fitzy

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