As a first guess, I would say that it is time for a cooling system cleaning.
You can try using a radiator flush, but you might have to have it done
professionally - removing the radiator and "boiling it out".
You should also make sure your belts and tight and the hoses good - a
collapsed lower hose can cause that problem too. Sometimes an inner flap of
the hose can come loose and block the passage, while it looks fine from the
outside. But if the cooling system hasn't been attended to for the last 20+
years, it is due for cleaning out.
Mike
Mark Purtell wrote:
> I just bought my first MGB-its a 1977, and I believe that it is 100%
> stock. The car overheats after driving it for 20-30 minutes, and then it
> will stay in overheat for a 1-3 minutes and then return to normal
> operating temperature, only to have the whole process occur again at a
> later time. I have replaced the thermostat (195 degrees), and the
> temperature sensor. I have noticed that the lower radiator hose doesn't
> build pressure even when the car is warmed up/overheating.
>
> Any suggestions?
>
> Mark
--
Mike Sloane
Allamuchy NJ
(msloane@att.net)
<http://home.att.net/~msloane>
or <http://www.geocities.com/mikesloane>
The whole aim of practical politics
is to keep the populace alarmed -- and
thus clamorous to be led to safety --
by menacing it with an endless series
of hobgoblins, all of them imaginary.
-- H.L. Mencken
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