[Healeys] Coolant Expansion Bottle

[Oudesluys]

If the radiator cap is airtight it always will pull back the coolant.
Kees Oudesluijs


Op 15-11-2016 om 20:36 schreef David Nock BCS:
> Yes but if the car has a non pressurized system it may not pull the 
> coolant back when it cools down
> David Nock
> British Car Specialists
> 209-948-8767
> www.britishcarspecialists.com
> *From:* Michael Oritt <mailto:michael.oritt at gmail.com>
> *Sent:* Tuesday, November 15, 2016 9:21 AM
> *To:* David Nock <mailto:healeydoc at gmail.com>
> *Cc:* Austin Healey <mailto:healeys at autox.team.net>
> *Subject:* Re: [Healeys] Coolant Expansion Bottle
> 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 
> <mailto: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 <mailto:healeydoc at sbcglobal.net>
>     209 948 8767
>     www.britishcarspecialists.com <http://www.britishcarspecialists.com>
>     *From:* Michael Oritt <mailto:michael.oritt at gmail.com>
>     *Sent:* Tuesday, November 15, 2016 5:31 AM
>     *To:* Patrick & Caroline Quinn <mailto:p_cquinn at tpg.com.au>
>     *Cc:* Austin Healey <mailto: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 <mailto: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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