[Healeys] Radiator cap with expansion tank.

[Bob Haskell]

FWIW, our '80 MGB has the cap on the expansion tank.  No cap on the 
radiator.  Ought to work the same as long as the hose between the two 
can withstand the coolant temperature/pressure. There's a fitting on top 
of the thermostat housing for topping off the cooling system.

Bob Haskell
Austin-Healey 3000 roadster registrar

On 10/11/25 13:03, Jim Ryan wrote:
> 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 logichas let me
>     down before.
>
>     Simon
>
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