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The issue with installing an expansion tank on an Austin Healey is the
difficulty in finding a location under the hood. For an expansion tank to
work properly the neck and cap must be at the highest point in the cooling
system so air can rise to the highest point.
A coolant recovery tank, on the other hand, can be installed at any
elevation which is why I suggested they are more suitable for our Healeys
See the following from Canton who are experts in the field.
Expansion Tank Set Up:
An expansion tank is part of the pressurized section of the coolant system.
An expansion tank can easily be recognized by the neck and cap used. Since
the tank is under pressure it will require a pressure rated cap and neck.
The pressure relief in the expansion tank should be the highest point in
your coolant system.
Harold
On Sat, Oct 11, 2025 at 5:35=E2=80=AFPM JSARCH via Healeys <healeys@autox.t=
eam.net>
wrote:
> This respones is correct.
>
>
>
> *From:* Healeys <healeys-bounces@autox.team.net> *On Behalf Of *Jim Ryan
> *Sent:* Saturday, October 11, 2025 2:03 PM
> *To:* Simon Lachlan <simon.lachlan@alexarevel.plus.com>
> *Cc:* Healeys <healeys@autox.team.net>
> *Subject:* Re: [Healeys] Radiator cap with expansion tank.
>
>
>
> Hey Simon,
>
>
>
> No, the radiator cap stays on the radiator. Increased pressure in the
> radiator raises the boiling point. If the radiator gets hot enough for th=
e
> pressure to release the cab then the overflow will go into the wall bottl=
e.
> Once it cools down it's supposed to get pulled back into the radiator. Of
> course, this is a British car so theory and reality May differ. But you
> definitely want to leave a lady in the cop on the radiator.
>
>
>
>
>
>
>
> Jim Ryan
>
> =C2=A9=C2=BF=C2=A9=C2=AC
>
>
>
> On Sat, Oct 11, 2025, 11:45=E2=80=AFAM Simon Lachlan via Healeys <
> healeys@autox.team.net> wrote:
>
> Forgive another stupid question but it=E2=80=99s sensible to be sure=E2=
=80=A6=E2=80=A6=E2=80=A6.
>
> Am I right in assuming(!) that, if one fits an expansion tank, the
> standard cap is moved from the radiator to the expansion tank and is
> replaced by a blanking(?) cap ie one which has no spring, no means of
> relief etcetc? Seem logical to me but logic has let me down before.
>
> Simon
>
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>
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>
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<div dir=3D"ltr">The issue with installing an expansion tank on an Austin H=
ealey is the difficulty in finding a location under the hood. For an expans=
ion tank to work properly the neck and cap must be at the highest point in =
the cooling system so air can rise to the highest point.<div><br></div><div=
>A coolant recovery tank, on the other hand, can be installed at any elevat=
ion which is why I suggested they are more suitable for our Healeys<br><div=
><br></div><div>See the following from Canton who are experts in the field.=
</div><div><br></div><div><p class=3D"MsoNormal" style=3D"margin:0cm 0cm 0.=
0001pt;font-size:12pt;font-family:"Times New Roman"">Expansion Ta=
nk Set Up:<br>
An expansion tank is part of the pressurized section of the coolant system.=
An
expansion tank can easily be recognized by the neck and cap used. Since the
tank is under pressure it will require a pressure rated cap and neck. The
pressure relief in the expansion tank should be the highest point in your
coolant system.</p><p class=3D"MsoNormal" style=3D"margin:0cm 0cm 0.0001pt;=
font-size:12pt;font-family:"Times New Roman""><br></p><p class=3D=
"MsoNormal" style=3D"margin:0cm 0cm 0.0001pt;font-size:12pt;font-family:&qu=
ot;Times New Roman"">Harold</p></div></div></div><br><div class=3D"gma=
il_quote gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Sa=
t, Oct 11, 2025 at 5:35=E2=80=AFPM JSARCH via Healeys <<a href=3D"mailto=
:healeys@autox.team.net">healeys@autox.team.net</a>> wrote:<br></div><bl=
ockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-lef=
t:1px solid rgb(204,204,204);padding-left:1ex"><div class=3D"msg-6620934605=
535635207"><div lang=3D"EN-US" style=3D"overflow-wrap: break-word;"><div cl=
ass=3D"m_-6620934605535635207WordSection1"><p class=3D"MsoNormal"><span sty=
le=3D"font-size:11pt;font-family:Calibri,sans-serif">This respones is corre=
ct.<u></u><u></u></span></p><p class=3D"MsoNormal"><span style=3D"font-size=
:11pt;font-family:Calibri,sans-serif"><u></u>=C2=A0<u></u></span></p><div s=
tyle=3D"border-right:none;border-bottom:none;border-left:none;border-top:1p=
t solid rgb(225,225,225);padding:3pt 0in 0in"><p class=3D"MsoNormal"><b><sp=
an style=3D"font-size:11pt;font-family:Calibri,sans-serif">From:</span></b>=
<span style=3D"font-size:11pt;font-family:Calibri,sans-serif"> Healeys <=
<a href=3D"mailto:healeys-bounces@autox.team.net"; target=3D"_blank">healeys=
-bounces@autox.team.net</a>> <b>On Behalf Of </b>Jim Ryan<br><b>Sent:</b=
> Saturday, October 11, 2025 2:03 PM<br><b>To:</b> Simon Lachlan <<a hre=
f=3D"mailto:simon.lachlan@alexarevel.plus.com"; target=3D"_blank">simon.lach=
lan@alexarevel.plus.com</a>><br><b>Cc:</b> Healeys <<a href=3D"mailto=
:healeys@autox.team.net" target=3D"_blank">healeys@autox.team.net</a>><b=
r><b>Subject:</b> Re: [Healeys] Radiator cap with expansion tank.<u></u><u>=
</u></span></p></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><div><d=
iv><p class=3D"MsoNormal">Hey Simon,<u></u><u></u></p></div><div><p class=
=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"MsoNormal">No=
, the radiator cap stays on the radiator. Increased pressure in the radiato=
r raises the boiling point. If the radiator gets hot enough for the pressur=
e to release the cab then the overflow will go into the wall bottle. Once i=
t cools down it's supposed to get pulled back into the radiator. Of cou=
rse, this is a British car so theory and reality May differ. But you defini=
tely want to leave a lady in the cop on the radiator.<u></u><u></u></p></di=
v><div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=
=3D"MsoNormal"><u></u>=C2=A0<u></u></p></div><div><p class=3D"MsoNormal"><u=
></u>=C2=A0<u></u></p></div><div><div><p><span style=3D"font-size:10pt;colo=
r:navy">Jim Ryan</span><span style=3D"font-size:9.5pt"><u></u><u></u></span=
></p><p><span style=3D"font-size:9.5pt">=C2=A9=C2=BF=C2=A9=C2=AC<u></u><u><=
/u></span></p></div></div></div><p class=3D"MsoNormal"><u></u>=C2=A0<u></u>=
</p><div><div><p class=3D"MsoNormal">On Sat, Oct 11, 2025, 11:45<span style=
=3D"font-family:Arial,sans-serif">=E2=80=AF</span>AM Simon Lachlan via Heal=
eys <<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank">healeys=
@autox.team.net</a>> wrote:<u></u><u></u></p></div><blockquote style=3D"=
border-top:none;border-right:none;border-bottom:none;border-left:1pt solid =
rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in=
"><div><p><span lang=3D"EN-GB">Forgive another stupid question but it=E2=80=
=99s sensible to be sure=E2=80=A6=E2=80=A6=E2=80=A6.</span><u></u><u></u></=
p><p><span lang=3D"EN-GB">Am I right in assuming(!) that, if one fits an ex=
pansion tank, the standard cap is moved from the radiator to the expansion =
tank and is replaced by a blanking(?) cap ie one which has no spring, no me=
ans of relief etcetc? Seem logical to me but logic has let me down before.<=
/span><u></u><u></u></p><p><span lang=3D"EN-GB">Simon</span><u></u><u></u><=
/p></div><p class=3D"MsoNormal" style=3D"margin-bottom:12pt">______________=
_________________________________<br>Support Team.Net <a href=3D"http://www=
.team.net/donate.html" target=3D"_blank">http://www.team.net/donate.html</a=
><br>Suggested annual donation=C2=A0 $12.75<br><br>Archive: <a href=3D"http=
://www.team.net/pipermail/healeys" target=3D"_blank">http://www.team.net/pi=
permail/healeys</a> <a href=3D"http://autox.team.net/archive/healeys"; targe=
t=3D"_blank">http://autox.team.net/archive/healeys</a><br><br><a href=3D"ma=
ilto:Healeys@autox.team.net" target=3D"_blank">Healeys@autox.team.net</a><b=
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@jimryan.com</a><u></u><u></u></p></blockquote></div></div></div>__________=
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</div></blockquote></div>
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_______________________________________________
Archive: http://www.team.net/pipermail/healeys
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