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    <p>Do not turn it off. It might save you from overheating the engine
      on a very hot day or fan failure. When you see the coolant
      temperature rise expectantly turn on the heating with the heater
      fan full blast for some extra cooling of the engine (but over
      heating the driver and SWMBO). However check first if there is any
      coolant in the system at all.<br>
      Kees Oudesluijs<br>
    </p>
    <div class="moz-cite-prefix">Op 10-7-2023 om 16:26 schreef Simon
      Lachlan via Healeys:<br>
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      cite="mid:000701d9b33a$80615dc0$81241940$@alexarevel.plus.com">
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        <p class="MsoNormal">I have a MkII BT7 with a normal Smith’s
          heater. Normal insofar as it never seems to be turned OFF 100%
          or ON 100%.<o:p></o:p></p>
        <p class="MsoNormal">We are in our summer(?!) at the moment and
          I was wondering about turning off the tap in the hose from the
          block that leads into the cabin for the heater.<o:p></o:p></p>
        <p class="MsoNormal">Would the heater box and/or its valve
          semi-dry out and fill with a mess of rusty crud?<o:p></o:p></p>
        <p class="MsoNormal">Would the engine run hotter as there was a
          little less water running through the system?<o:p></o:p></p>
        <p class="MsoNormal">Or would I find myself basking in cool
          luxury as I tootle off to the local boozer?<o:p></o:p></p>
        <p class="MsoNormal">Or, most likely, none of the above,
          especially the last one?!<o:p></o:p></p>
        <p class="MsoNormal">I did take the car on quite a long trip the
          other day (Le Mans Classic!!) and, once the heat had soaked
          through the insulation, we were quite warm….<o:p></o:p></p>
        <p class="MsoNormal">The more I think about this, the less I
          like the idea of turning that tap off…..<o:p></o:p></p>
        <p class="MsoNormal">The tap does work, before you all shout at
          once!<o:p></o:p></p>
        <p class="MsoNormal">Simon<o:p></o:p></p>
      </div>
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