[Healeys] Jaguar problem

[Richard Ewald]

All the symptoms you list ( high temp, no AC, fans staying on, trans shifting)
indicate the ECM thinks the car is overheating.
You could have an o/ heat issue
Or a bad temp sensor or the wire to the sensor shorting to ground.
I would verify that there isn't an actual overheat issue first.
If you don't have one Harbor Freight sells a laser guided non contact
thermometer for about $25.
Get one. Measure the temps at the water outlet from the engine and at the
outlet from the rad.
Verify the coolant is full in the system not just the overflow bottle.
Then if all of that checks out look at the sensor and wiring.
Rick

Sent from my iPhone

On Jun 8, 2013, at 15:29, Leonard Berkowitz <drberkowitz at hotmail.com> wrote:

> Hi out there
>
> Hopefully one of you can either help me or knows someone who can help me
with
> my problem.
>
> My 1998 Jaguar XJ8 has about 75000 miles. This is the first Jaguar like
> problem I have ever had.
>
> Nothing makes sense.  After the engine is warmed up the following problems
all
> start at once
>
> 1) The temperature gauge rockets up to the top and the warning light comes
> on.
> 2) The air conditioner suddenly shuts off and warm air starts blowing into
the
> car.
> 3) The transmission refuses to shift past third gear.  (biggest problem!)
> 4) When I shut the car off the electric fans continue to run at high speed
for
> an unusually long period of time
>
> I checked the water level and found it to be topped off properly.  I
haven't
> checked the transmission oil level since it is a sealed unit and there is
no
> dipstick, just a fill plug which I haven't crawled under the car to check
yet.
> I doubt, however, if that is a problem since there are no signs of leakage
> under the car.
>
> I thought that perhaps the tranny was overheating or that the temp sensory
was
> faulty and might be sending an incorrect signal to the computer causing the
> tranny to stay at high revs to help cool the engine, but why would the AC
shut
> down?
>
> I can't see the connection between the problems, other then perhaps a
computer
> malfunction.
>
> Any ideas would be welcome.
>
> Len B
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