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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@tpg.com.au> wrote:
> G=E2=80=99day
>
>
>
> 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=E2=80=99s assisted by an electric fan in front of the radiator, but wi=
th our
> warmer climate it persists is dumping its coolant out through the overflo=
w
> 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 th=
e
> 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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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"color:#3333ff">Patri=
ck--</div><div class=3D"gmail_default" style=3D"color:#3333ff"><br></div><d=
iv class=3D"gmail_default" style=3D"color:#3333ff">The system will draw coo=
lant back into the system from the expansion tank only if the end of the ho=
se is submerged in coolant, either because it enters the tank from the bott=
om 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 ord=
er to draw liquid.</div><div class=3D"gmail_default" style=3D"color:#3333ff=
"><br></div><div class=3D"gmail_default" style=3D"color:#3333ff">Best--Mich=
ael Oritt</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quo=
te">On Mon, Nov 14, 2016 at 3:37 PM, Patrick & Caroline Quinn <span dir=
=3D"ltr"><<a href=3D"mailto:p_cquinn@tpg.com.au"; target=3D"_blank">p_cqu=
inn@tpg.com.au</a>></span> wrote:<br><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div=
lang=3D"EN-AU" link=3D"blue" vlink=3D"purple"><div class=3D"m_743524168747=
0160984WordSection1"><p class=3D"MsoNormal"><span style=3D"font-size:10.0pt=
;font-family:"Times New Roman","serif"">G=E2=80=99day<u=
></u><u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-size:10.0=
pt;font-family:"Times New Roman","serif""><u></u>=C2=A0=
<u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;fo=
nt-family:"Times New Roman","serif"">I know the subject=
of fitting a coolant expansion bottle has been covered before, but this ha=
s a twist as it concerns a Healey and not an Austin-Healey.<u></u><u></u></=
span></p><p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family=
:"Times New Roman","serif""><u></u>=C2=A0<u></u></span>=
</p><p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quo=
t;Times New Roman","serif"">Our Healey Duncan has its origin=
al cooling system that is unpressurised. It=E2=80=99s assisted by an electr=
ic fan in front of the radiator, but with our warmer climate it persists is=
dumping its coolant out through the overflow pipe.<u></u><u></u></span></p=
><p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"T=
imes New Roman","serif""><u></u>=C2=A0<u></u></span></p><p c=
lass=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Times =
New Roman","serif"">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 coo=
lant from exiting via the overflow pipe.<u></u><u></u></span></p><p class=
=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Times New =
Roman","serif""><u></u>=C2=A0<u></u></span></p><p class=3D"M=
soNormal"><span style=3D"font-size:10.0pt;font-family:"Times New Roman=
","serif"">I am thinking of fitting a coolant expansion bott=
le 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.<u></u><u></u></span></p><p class=3D"MsoNormal">=
<span style=3D"font-size:10.0pt;font-family:"Times New Roman",&qu=
ot;serif""><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span=
style=3D"font-size:10.0pt;font-family:"Times New Roman","se=
rif"">Any opinions?<u></u><u></u></span></p><p class=3D"MsoNormal"><sp=
an style=3D"font-size:10.0pt;font-family:"Times New Roman","=
serif""><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span st=
yle=3D"font-size:10.0pt;font-family:"Times New Roman","serif=
"">Thanks<u></u><u></u></span></p><p class=3D"MsoNormal"><span style=
=3D"font-size:10.0pt;font-family:"Times New Roman","serif&qu=
ot;"><u></u>=C2=A0<u></u></span></p><p class=3D"MsoNormal"><span style=3D"f=
ont-size:10.0pt;font-family:"Times New Roman","serif"">=
Patrick Quinn<u></u><u></u></span></p><p class=3D"MsoNormal"><span style=3D=
"font-size:10.0pt;font-family:"Times New Roman","serif"=
">Blue Mountains, Australia<u></u><u></u></span></p></div></div><br>_______=
_______________________<wbr>_________________<br>
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<br></blockquote></div><br></div>
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