[Healeys] Coolant Expansion Bottle

[Michael Oritt]

David--

Yes, a sealed cap which includes those with the button vent that
essentially pulls in and seals when there is a vacuum in the system below
it.

Best--Michael Oritt

On Tue, Nov 15, 2016 at 11:33 AM, David Nock <healeydoc at gmail.com> wrote:

> 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 <michael.oritt at gmail.com>
> *Sent:* Tuesday, November 15, 2016 5:31 AM
> *To:* Patrick & Caroline Quinn <p_cquinn at tpg.com.au>
> *Cc:* Austin Healey <healeys at autox.team.net>
> *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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>
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