[Healeys] Coolant Expansion Bottle

[John Rowe]

Hi Patrick

The radiator should not be filled to the top. Fill it only to about an 
inch from the top to allow for the water expansion.

This was the norm before expansion tanks were used. My Silverstone ran 
this way all through the highs and lows of Italy in 32 deg plus days.

Regards

John Rowe
Perth

On 15-11-2016 4:37 AM, Patrick & Caroline Quinn wrote:
>
> 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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