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    <p><font face="Arial">Hi Patrick</font></p>
    <p><font face="Arial">The radiator should not be filled to the top.
        Fill it only to about an inch from the top to allow for the
        water expansion.</font></p>
    <p><font face="Arial">This was the norm before expansion tanks were
        used. My Silverstone ran this way all through the highs and lows
        of Italy in 32 deg plus days.</font></p>
    <p><font face="Arial">Regards</font></p>
    <font face="Arial">John Rowe</font><br>
    <font face="Arial">Perth</font><br>
    <br>
    <div class="moz-cite-prefix">On 15-11-2016 4:37 AM, Patrick &
      Caroline Quinn wrote:<br>
    </div>
    <blockquote cite="mid:008a01d23eb6$e7a81cd0$b6f85670$@tpg.com.au"
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        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:"Times New
            Roman","serif"">G’day<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:"Times New
            Roman","serif""><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:"Times New
            Roman","serif"">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.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:"Times New
            Roman","serif""><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:"Times New
            Roman","serif"">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.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:"Times New
            Roman","serif""><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="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 coolant from exiting
            via the overflow pipe.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:"Times New
            Roman","serif""><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:"Times New
            Roman","serif"">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.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:"Times New
            Roman","serif""><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:"Times New
            Roman","serif"">Any opinions?<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:"Times New
            Roman","serif""><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:"Times New
            Roman","serif"">Thanks<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:"Times New
            Roman","serif""><o:p> </o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:"Times New
            Roman","serif"">Patrick Quinn<o:p></o:p></span></p>
        <p class="MsoNormal"><span
            style="font-size:10.0pt;font-family:"Times New
            Roman","serif"">Blue Mountains, Australia<o:p></o:p></span></p>
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