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<p>FWIW, our '80 MGB has the cap on the expansion tank. No cap on
the radiator. Ought to work the same as long as the hose between
the two can withstand the coolant temperature/pressure. There's a
fitting on top of the thermostat housing for topping off the
cooling system.</p>
<pre class="moz-signature" cols="72">Bob Haskell
Austin-Healey 3000 roadster registrar</pre>
<div class="moz-cite-prefix">On 10/11/25 13:03, Jim Ryan wrote:<br>
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cite="mid:CAEajuYwx0w8WXXWtymdX9bFw5wOejJ1uuyTsRkwbVmLwY3-OeA@mail.gmail.com">
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<div>Hey Simon,</div>
<div dir="auto"><br>
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<div dir="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 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.</div>
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<div dir="ltr">
<p style="font-size:12.8000001907349px"><span
style="font-size:10pt;color:navy">Jim Ryan</span></p>
<p style="font-size:12.8000001907349px">©¿©¬</p>
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<div class="gmail_quote gmail_quote_container">
<div dir="ltr" class="gmail_attr">On Sat, Oct 11, 2025, 11:45 AM
Simon Lachlan via Healeys <<a
href="mailto:healeys@autox.team.net" moz-do-not-send="true"
class="moz-txt-link-freetext">healeys@autox.team.net</a>>
wrote:<br>
</div>
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style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p dir="LTR"><span lang="en-gb"><font face="Aptos">Forgive
another st</font></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"><font
face="Aptos">upid question but it’s sensible to be
sure……….</font></span></p>
<p dir="LTR"><span lang="en-gb"><font face="Aptos">Am I
right in assuming(!) that, if one fits an expan</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"><font face="Aptos">sion tank, the standard
cap is moved from the radiator to the expansion tank
and is replaced by a blank</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"><font face="Aptos">ing(?) cap ie one which
has no spring, no means of relief etcetc</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"><font face="Aptos">? Seem logical to me but
logic</font></span><span lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb"><font
face="Aptos"> has let me down before</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"><font face="Aptos">.</font></span></p>
<p dir="LTR"><span lang="en-gb"><font face="Aptos">Simon</font></span><span
lang="en-gb"></span><span lang="en-gb"></span><span
lang="en-gb"></span></p>
</div>
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