[Healeys] Coolant Expansion Bottle

[Oudesluys]

It will work fine on an unpressurised system. No real difference with a 
pressurised system.
However the radiator cap needs to be absolutely airtight. You would 
probably need an overflow bottle of minimum 2 litres. The hose in the 
overflow bottle should end near the bottom or the overflow bottle should 
have an inlet pipe at the bottom. It should also have a vent in the cover.
Fill the bottle halfway and keep replenishing for the first few weeks as 
fluid will be drawn back into the radiator until it is full to the brim.
Kees Oudesluijs



Op 14-11-2016 om 21:37 schreef Patrick & Caroline Quinn:
>
> G’day
>
> I know the subject of fitting a coolant expansion bottle has been 
> covered before, but this has a twist as it concerns a Healey and not 
> an Austin-Healey.
>
> Our Healey Duncan has its original cooling system that is 
> unpressurised. It’s assisted by an electric fan in front of the 
> radiator, but with our warmer climate it persists is dumping its 
> coolant out through the overflow pipe.
>
> The radiator cap is a screw on type and the overflow pipe exits the 
> radiator header tank separately in front of the cap. Being 
> unpressurised there is nothing to stop the hot and expanded coolant 
> from exiting via the overflow pipe.
>
> I am thinking of fitting a coolant expansion bottle but am wondering 
> if this will work on an unpressurised system. It seems to me that it 
> should not make any difference, because if the coolant cannot escape 
> to the outside world when it expands then it should flow back into the 
> radiator once it cools.
>
> Any opinions?
>
> Thanks
>
> Patrick Quinn
>
> Blue Mountains, Australia
>
>
>
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