Thanks, Paul & Jim
I'm sure now its an airlock. I took the car for a good run yesterday,
and at one point I realised the heater had been gradually cooling down
when it suddenly started pushing out hot air again. As for the gauge,
when it settles down it reads as expected; the problem really is the
wild fluctuation before that happens (and of course that's only a
problem if any part of the engine is running too hot; if not, then the
black tape over the gauge is the answer!)
Although I'm not a slave to concours or originality, my car is an early
factory model - #127 making it contemporaneous with the Press cars.
So I'm looking for a solution which involve no mods or easily-reversible
mods.
I'm assuming that if I can get rid of the airlock by careful bleeding, and
keep enough coolant in the header tank, then no new air can enter the
system.
Simon Holt
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