[Healeys] Radiator cap with expansion tank.

[Jim Ryan]

Hey Simon,

No, the radiator cap stays on the radiator. Increased pressure in the
radiator raises the boiling point. If the radiator gets hot enough for the
pressure to release the cab then the overflow will go into the wall bottle.
Once it cools down it's supposed to get pulled back into the radiator. Of
course, this is a British car so theory and reality May differ. But you
definitely want to leave a lady in the cop on the radiator.



Jim Ryan

©¿©¬

On Sat, Oct 11, 2025, 11:45 AM Simon Lachlan via Healeys <
healeys at autox.team.net> wrote:

> Forgive another stupid question but it’s sensible to be sure……….
>
> Am I right in assuming(!) that, if one fits an expansion tank, the
> standard cap is moved from the radiator to the expansion tank and is
> replaced by a blanking(?) cap ie one which has no spring, no means of
> relief etcetc? Seem logical to me but logic has let me down before.
>
> Simon
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