[Healeys] Overheating query

Alan Seigrist healey.nut at gmail.com
Wed Sep 7 20:51:40 MDT 2016


Simon -

If the rad water is hot, it means the thermostat has failed in the closed
position.  Just replace the thermostat.  There should be a tiny bypass
hole, so you will get a teeny tiny amount of cooling, but don't drive the
car until you replace the thermostat.

Cheers,

Alan

On Thu, Sep 8, 2016 at 12:19 AM, Simon Lachlan <simon.lachlan at homecall.co.uk
> wrote:

> Hi,
>
> This isn’t the usual one ....”my car always runs hot; what’s the cure?” etc
>
> No, this is my very own original.....
>
> Background:-
>
> 1)      The car, MkII BT7, has never had overheating issues before today.
>
> 2)      It has a new, 12 month, modern design radiator.
>
> 3)      It has the correct type(original design) Smiths sleeved
> thermostat. (5 years old +/-).
>
> 4)      The waterpump was in the car when I bought the car +/- 25 yrs ago.
>
> Today’s symptoms:-
>
> 1)      I took it out to the pub today and, on returning, I noticed that
> there was HEAT and then that the gauge was off the scale.
>
> 2)      There was plenty of coolant in the rad and it didn’t seem overly
> hot.
>
> 3)      I didn’t have much time, but I got the impression that the rad
> was not blowing steam or making more of a “cooling-off noise” than usual.
>
> 4)      I also got the impression that the engine was hotter than the rad.
>
> Is this typical of a failed water pump?
>
> How can one differentiate between thermostat issues and waterpump issues?
>
>
>
> Any ideas?
>
> Simon
>
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