A couple of questions.
What kind of cap is on the expansion tank, screw on or pressure cap
like the radiator ?
Is the over flow line below the cap or above it like the radiator?
If it is the latter then the pressure cap should be on the over flow
tank and a cap to just keep the coolant in should be on the
radiator. In theory it should not make any difference but I found it
did on my car. Having two pressure caps in the system just did not
work. Also I have adapted a solid brass over flow tank from some
where (1500?) to the bugeye so that may make a difference.
1960 Austin Healey Sprite (Mk IV in disguise)
1966 Austin Healey Sprite Mk III (Trevor)
2000 Miata Special Edition
On Apr 24, 2008, at 7:32 PM, Lester wrote:
> I have similar symptoms although not as severe.. my current diagnosis
> is the my radiator cap, as yours may be, is not actually sealing on
> the inner section. I noticed this because there is nice shiny brass
> for a section of the inner ring of the filler neck but not the entire
> way around. My guess is that the filler neck is not "square".
> .. no, I haven't fixed mine either..
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