[Healeys] Coolant Expansion Bottle

[David Nock]

It will only draw the coolant back and forth from the expansion tank if the radiator cap is a sealed cap. 

David Nock
healeydoc at sbcglobal.net
209 948 8767
www.britishcarspecialists.com

From: Michael Oritt 
Sent: Tuesday, November 15, 2016 5:31 AM
To: Patrick & Caroline Quinn 
Cc: Austin Healey 
Subject: Re: [Healeys] Coolant Expansion Bottle

Patrick--

The system will draw coolant back into the system from the expansion tank only if the end of the hose is submerged in coolant, either because it enters the tank from the bottom or from the top in which case, as Kimo points out, the hose clamps must be tight so that the vacuum created within the radiator is preserved in order to draw liquid.

Best--Michael Oritt

On Mon, Nov 14, 2016 at 3:37 PM, Patrick & Caroline Quinn <p_cquinn at tpg.com.au> 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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