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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 the
pressure to release the cab then the overflow will go into the wall bottle.
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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<div dir=3D"auto"><div>Hey Simon,</div><div dir=3D"auto"><br></div><div dir=
=3D"auto">No, the radiator cap stays on the radiator. Increased pressure in=
the radiator raises the boiling point. If the radiator gets hot enough for=
the pressure to release the cab then the overflow will go into the wall bo=
ttle. Once it cools down it's supposed to get pulled back into the radi=
ator. Of course, this is a British car so theory and reality May differ. Bu=
t you definitely want to leave a lady in the cop on the radiator.</div><div=
dir=3D"auto"><br></div><div dir=3D"auto"><br></div><div><br></div><div dat=
a-smartmail=3D"gmail_signature"><div dir=3D"ltr"><p style=3D"font-size:12.8=
000001907349px"><span style=3D"font-size:10pt;color:navy">Jim Ryan<u></u><u=
></u></span></p><p style=3D"font-size:12.8000001907349px">=C2=A9=C2=BF=C2=
=A9=C2=AC</p></div></div></div><br><div class=3D"gmail_quote gmail_quote_co=
ntainer"><div dir=3D"ltr" class=3D"gmail_attr">On Sat, Oct 11, 2025, 11:45=
=E2=80=AFAM Simon Lachlan via Healeys <<a href=3D"mailto:healeys@autox.t=
eam.net">healeys@autox.team.net</a>> wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex"><u></u>
<div>
<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Aptos">Forgive another st=
</font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span=
lang=3D"en-gb"><font face=3D"Aptos">upid question but it=E2=80=99s sensibl=
e to be sure=E2=80=A6=E2=80=A6=E2=80=A6.</font></span></p>
<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Aptos">Am I right in assu=
ming(!) that, if one fits an expan</font></span><span lang=3D"en-gb"></span=
><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Aptos">sion=
tank, the standard cap is moved from the radiator to the expansion tank an=
d is replaced by a blank</font></span><span lang=3D"en-gb"></span><span lan=
g=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Aptos">ing(?) cap ie =
one which has no spring, no means of relief etcetc</font></span><span lang=
=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font fa=
ce=3D"Aptos">? Seem logical to me but logic</font></span><span lang=3D"en-g=
b"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Ap=
tos"> has let me down before</font></span><span lang=3D"en-gb"></span><span=
lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Aptos">.</font></=
span></p>
<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Aptos">Simon</font></span=
><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-g=
b"></span></p>
</div>
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</blockquote></div>
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