Re: FW: [xj-s] The ubuiquitous overheating problem

[dmeadow@juno.com]

On Sat, 25 Jul 1998 08:08:47 -0500 "Joseph Cortney"
<jcortney@bizcenters.com> writes:
>
>Still above the "N".  
>
>Now this is LIGHT YEARS better than it was before all the repairs 
>(half way
>between the "N" and "H" but still not what everyone else is reporting.

Joe:-

I don't think everyone else is looking at the same ambient temperature
you are.  My radiator was rodded out by the PO some eighteen months ago
and the cooling system is otherwise in good shape as far as I know.  I
have noticed a distinct difference in the engine temperature between
about 95 degrees outside temperature and 100.  As you know, it has been
about 100 degrees in Houston most of this summer. 

 In most cases, when driving a combination of highway and
bumper-to-bumper stop-and-go in the hot sun, my temp gauge will read
right at the top of the N.  When I park the car, the auxilliary fan will
run for a while after shutting down the engine.

This doesn't happen when the temperature falls below about 95 degrees. 
We had a "cold front" move through the other day that dropped the temp to
about 91.  At that temperature, the needle didn't move above the center
of the N and the auxilliary fan did not come on.

I think what you are experiencing is normal operation.  There is no doubt
in my mind that the packed engine compartment, the huge engine, combined
with no place for the heat to escape out the top, results in high engine
temperatures that the cooling system, even at peak condition, just can't
fully control.

Personally, I wonder that Jaguar fully developed the car for the kind of
heat that we have seen here in Texas.  Given their financial resources, I
doubt they did the kind of heat testing that most major manufacturers now
do in Arizona, for example.  Hell, they didn't even have the money to
develop a cam gasket that didn't leak!  As I've said before, I think the
British engineers tended not to focus on such things, given that the
temperature on the island rather climbs above the 70's.  My MG's also
tend to run pretty hot in this kind of weather, although they won't boil
over if the colling system is in good shape.

I think you can stop worrying about the car at this point and just pray
for cooler weather.

David Littlefield
Houston, TX
'62 MGA MkII
'51 MGTD
'88 Jaguar XJ-S

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References:

• FW: [xj-s] The ubuiquitous overheating problem
• From: "Joseph Cortney" <jcortney@bizcenters.com>

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