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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
> *Sent:* Tuesday, November 15, 2016 9:21 AM
> *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@gmail.com
>
> It will only draw the coolant back and forth from the expansion
> tank if the radiator cap is a sealed cap.
> David Nock
> 209 948 8767
> www.britishcarspecialists.com <http://www.britishcarspecialists.com>
> *Sent:* Tuesday, November 15, 2016 5:31 AM
> *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
>
> 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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<div class="moz-cite-prefix">If the radiator cap is airtight it
always will pull back the coolant.<br>
Kees Oudesluijs<br>
<br>
<br>
Op 15-11-2016 om 20:36 schreef David Nock BCS:<br>
</div>
<blockquote cite="mid:04178D07A0DD45F5BD11ECB8CFEF64AC@DavidNockHP"
type="cite">
<meta http-equiv="Context-Type" content="text/html; charset=UTF-8">
<div dir="ltr">
<div>
<div>Yes but if the car has a non pressurized system it may
not pull the coolant back when it cools down</div>
<div> </div>
<div> </div>
<div>David Nock<br>
British Car Specialists<br>
209-948-8767<br>
<a class="moz-txt-link-abbreviated"
href="http://www.britishcarspecialists.com";>www.britishcarspecialists.com</a></div>
<div>
<div>
<div> </div>
<div>
<div><b>From:</b> <a moz-do-not-send="true"
title="michael.oritt@gmail.com"
href="mailto:michael.oritt@gmail.com";>Michael Oritt</a>
</div>
<div><b>Sent:</b> Tuesday, November 15, 2016 9:21 AM</div>
<div><b>To:</b> <a moz-do-not-send="true"
title="healeydoc@gmail.com"
href="mailto:healeydoc@gmail.com";>David Nock</a> </div>
<div><b>Cc:</b> <a moz-do-not-send="true"
title="healeys@autox.team.net"
href="mailto:healeys@autox.team.net";>Austin Healey</a>
</div>
<div><b>Subject:</b> Re: [Healeys] Coolant Expansion
Bottle</div>
</div>
</div>
<div> </div>
</div>
<div>
<div dir="ltr">
<div class="gmail_default">David--</div>
<div class="gmail_default"> </div>
<div class="gmail_default">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.</div>
<div class="gmail_default"> </div>
<div class="gmail_default">Best--Michael Oritt</div>
</div>
<div class="gmail_extra">
<div> </div>
<div class="gmail_quote">On Tue, Nov 15, 2016 at 11:33 AM,
David Nock <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:healeydoc@gmail.com";
target="_blank">healeydoc@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote">
<div dir="ltr">
<div dir="ltr">
<div>
<div>It will only draw the coolant back and
forth from the expansion tank if the radiator
cap is a sealed cap. </div>
<div> </div>
<div>David Nock<br>
<a moz-do-not-send="true"
href="mailto:healeydoc@sbcglobal.net";
target="_blank">healeydoc@sbcglobal.net</a><br>
209 948 8767<br>
<a moz-do-not-send="true"
href="http://www.britishcarspecialists.com";
target="_blank">www.britishcarspecialists.com</a></div>
<div>
<div>
<div> </div>
<div>
<div><b>From:</b> <a
moz-do-not-send="true"
title="michael.oritt@gmail.com"
href="mailto:michael.oritt@gmail.com";
target="_blank">Michael Oritt</a> </div>
<div><b>Sent:</b> Tuesday, November 15,
2016 5:31 AM</div>
<div><b>To:</b> <a moz-do-not-send="true"
title="p_cquinn@tpg.com.au"
href="mailto:p_cquinn@tpg.com.au";
target="_blank">Patrick & Caroline
Quinn</a> </div>
<div><b>Cc:</b> <a moz-do-not-send="true"
title="healeys@autox.team.net"
href="mailto:healeys@autox.team.net";
target="_blank">Austin Healey</a> </div>
<div><b>Subject:</b> Re: [Healeys] Coolant
Expansion Bottle</div>
</div>
</div>
<div> </div>
</div>
<div>
<div>
<div class="h5">
<div dir="ltr">
<div class="gmail_default">Patrick--</div>
<div class="gmail_default"> </div>
<div class="gmail_default">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.</div>
<div class="gmail_default"> </div>
<div class="gmail_default">Best--Michael
Oritt</div>
</div>
<div class="gmail_extra">
<div> </div>
<div class="gmail_quote">On Mon, Nov 14,
2016 at 3:37 PM, Patrick &
Caroline Quinn <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:p_cquinn@tpg.com.au";
target="_blank">p_cquinn@tpg.com.au</a>></span>
wrote:<br>
<blockquote class="gmail_quote">
<div lang="EN-AU">
<div
class="m_2118124728570370457m_7435241687470160984WordSection1">
<p
class="MsoNormal"><span>G?day</span></p>
<p class="MsoNormal"><span></span> </p>
<p class="MsoNormal"><span>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.</span></p>
<p class="MsoNormal"><span></span> </p>
<p class="MsoNormal"><span>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.</span></p>
<p class="MsoNormal"><span></span> </p>
<p class="MsoNormal"><span>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.</span></p>
<p class="MsoNormal"><span></span> </p>
<p class="MsoNormal"><span>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.</span></p>
<p class="MsoNormal"><span></span> </p>
<p class="MsoNormal"><span>Any
opinions?</span></p>
<p class="MsoNormal"><span></span> </p>
<p
class="MsoNormal"><span>Thanks</span></p>
<p class="MsoNormal"><span></span> </p>
<p class="MsoNormal"><span>Patrick
Quinn</span></p>
<p class="MsoNormal"><span>Blue
Mountains, Australia</span></p>
</div>
</div>
<br>
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