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    The noise was excessive in my Austin-Healey (can't speak to
    Austin-Healys). The fan all but drowned-out the engine at idle and I
    didn't like sitting in a cloud of dust (but it was the
    most-effective temp-lowering mod I've tried).  Note the fan BCS
    originally sold was different than what I think they sell now; it
    had massively curved, rectangular blades--seven of them--that went
    from a couple inches of pitch to near-flat as speed increased. <br>
    <br>
    I only replace cores once (except when a water pump shaft broke and
    sent a fan into the radiator).<br>
    <br>
    Bob <br>
    <br>
    <br>
    <div class="moz-cite-prefix">On 10/5/2025 7:36 AM, Don Anglesey
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:SJ0PR04MB76144A087AB4BF096E410507FDE2A@SJ0PR04MB7614.namprd04.prod.outlook.com">
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        Your worried about a little noise in an Austin Healy?  Keep the
        cooler and continue to replace radiator cores.  There are
        several better options.  To each his own.</div>
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        Don</div>
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          <a href="https://aka.ms/AAb9ysg" moz-do-not-send="true">Outlook
            for Android</a></span></div>
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      <div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif"
          style="font-size:11pt" color="#000000"><b>From:</b> Healeys
          <a class="moz-txt-link-rfc2396E" href="mailto:healeys-bounces@autox.team.net"><healeys-bounces@autox.team.net></a> on behalf of Bob
          Spidell via Healeys <a class="moz-txt-link-rfc2396E" href="mailto:healeys@autox.team.net"><healeys@autox.team.net></a><br>
          <b>Sent:</b> Saturday, October 4, 2025 11:07:34 PM<br>
          <b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:healeys@autox.team.net">healeys@autox.team.net</a>
          <a class="moz-txt-link-rfc2396E" href="mailto:healeys@autox.team.net"><healeys@autox.team.net></a><br>
          <b>Subject:</b> Re: [Healeys] Yet another mystery</font>
        <div> </div>
      </div>
      <div>Except flex fans are extremely noisy. I got a 7-blade SS
        Hayden flex fan and BCS's own home-rolled shroud from them
        decades ago, and it was good for a 5-10deg reduction at idle
        but, damn was it loud (and it would blow clouds of dust out from
        under the car when stationary). Ditched it for a TC (but kept
        the shroud). Some SS flex fans are known for throwing a blade. <br>
        <br>
        bs<br>
        <br>
        <div class="x_moz-cite-prefix">On 10/4/2025 9:15 PM, Don
          Anglesey wrote:<br>
        </div>
        <blockquote type="cite">
          <div dir="auto"
style="font-family:Aptos,Aptos_MSFontService,-apple-system,Roboto,Arial,Helvetica,sans-serif; font-size:12pt">
            Ditch the Texas cooler, British car specialists sell a nice
            stainless-steel fan that doesn't flex into your radiator. </div>
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            Don</div>
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          <div id="x_divRplyFwdMsg" dir="ltr"><font
              face="Calibri, sans-serif" color="#000000"
              style="font-size:11pt"><b>From:</b> Healeys
              <a class="x_moz-txt-link-rfc2396E"
                href="mailto:healeys-bounces@autox.team.net"
                moz-do-not-send="true"><healeys-bounces@autox.team.net></a>
              on behalf of Richard Antal via Healeys
              <a class="x_moz-txt-link-rfc2396E"
                href="mailto:healeys@autox.team.net"
                moz-do-not-send="true"><healeys@autox.team.net></a><br>
              <b>Sent:</b> Friday, October 3, 2025 6:04:28 AM<br>
              <b>To:</b> Harold Manifold <a
                class="x_moz-txt-link-rfc2396E"
                href="mailto:manifold@telus.net" moz-do-not-send="true">
                <manifold@telus.net></a>; Michael Salter <a
                class="x_moz-txt-link-rfc2396E"
                href="mailto:michael.salter@gmail.com"
                moz-do-not-send="true">
                <michael.salter@gmail.com></a><br>
              <b>Cc:</b> Healeys <a class="x_moz-txt-link-rfc2396E"
                href="mailto:healeys@autox.team.net"
                moz-do-not-send="true">
                <healeys@autox.team.net></a><br>
              <b>Subject:</b> Re: [Healeys] Yet another mystery</font>
            <div> </div>
          </div>
          <div>
            <div class="x_x_ydp3f8c0b14yahoo-style-wrap"
style="font-family:Helvetica Neue,Helvetica,Arial,sans-serif; font-size:13px">
              <div dir="ltr" data-setdir="false">I inadvertently omitted
                an important detail: with the advent of cool weather in
                NH, rather than change the thermostat to 180 from 160, I
                slipped a piece of cardboard in front of the radiator. I
                had driven 200 miles in back roads with the cardboard in
                place and the temp gauge never got above 170, and so I
                didn't watch the temp gauge while dashing down the
                interstate at 80 mph. I was unaware of any problem until
                arriving home, I could smell radiator fluid. When I
                popped the hood all was wet, hot, and steaming. Perhaps
                at speeds 60mph and below the fan blades didn't flex
                enough but at 80 mph, they did and thus I inadvertently
                caused the damage to the radiator. I doesn't leak.
                Today, having removed the suspect cardboard, I'll
                venture forth and watch the temp gauge keenly.......rich</div>
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              <div><br>
              </div>
              <div id="x_x_ydp3f8c0b14yahoo_quoted_0026371616"
                class="x_x_ydp3f8c0b14yahoo_quoted">
                <div
style="font-family:'Helvetica Neue',Helvetica,Arial,sans-serif; font-size:13px">
                  <div>On Thursday, October 2, 2025 at 09:38:55 PM EDT,
                    Michael Salter <a class="x_moz-txt-link-rfc2396E"
                      href="mailto:michael.salter@gmail.com"
                      moz-do-not-send="true">
                      <michael.salter@gmail.com></a> wrote: </div>
                  <div><br>
                  </div>
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                    <div id="x_x_ydp3f8c0b14yiv2668703681">
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                        <div
style="font-family:Aptos,-apple-system,Roboto,Arial,Helvetica,sans-serif; font-size:12pt">
                          I would also suggest that you take a careful
                          look at the baffles that are, or should be,
                          installed forward from the sides of the
                          radiator to the grille. If these baffles
                          aren't correctly fitted hot air from the
                          backside of the radiator will swirl around to
                          the front and pass through the radiator again
                          and thus seriously deminish its cooling
                          ability.</div>
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style="font-family:Aptos,-apple-system,Roboto,Arial,Helvetica,sans-serif; font-size:12pt">
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                          M</div>
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                        <div id="x_x_ydp3f8c0b14yiv2668703681yqt68221"
class="x_x_ydp3f8c0b14yiv2668703681yqt4146443629">
                          <div dir="ltr"
id="x_x_ydp3f8c0b14yiv2668703681divRplyFwdMsg"><font
                              face="Calibri, sans-serif" color="#000000"
                              style="font-size:11pt"><b>From:</b>
                              Healeys
                              <a class="x_moz-txt-link-rfc2396E"
href="mailto:healeys-bounces@autox.team.net" moz-do-not-send="true"><healeys-bounces@autox.team.net></a>
                              on behalf of Harold Manifold
                              <a class="x_moz-txt-link-rfc2396E"
                                href="mailto:manifold@telus.net"
                                moz-do-not-send="true"><manifold@telus.net></a><br
                                clear="none">
                              <b>Sent:</b> Thursday, October 2, 2025
                              6:45:19 PM<br clear="none">
                              <b>To:</b> Richard Antal <a
                                class="x_moz-txt-link-rfc2396E"
                                href="mailto:rantal243@yahoo.com"
                                moz-do-not-send="true">
                                <rantal243@yahoo.com></a><br
                                clear="none">
                              <b>Cc:</b> Healeys <a
                                class="x_moz-txt-link-rfc2396E"
                                href="mailto:healeys@autox.team.net"
                                moz-do-not-send="true">
                                <healeys@autox.team.net></a><br
                                clear="none">
                              <b>Subject:</b> Re: [Healeys] Yet another
                              mystery</font>
                            <div> </div>
                          </div>
                          <div>
                            <div dir="ltr">Rich,
                              <div><br clear="none">
                              </div>
                              <div>Your comments "high speed. run of
                                twenty miles" and "extra series of
                                cooling tubes" may offer some clues. Fan
                                blades flex away from the side that
                                pushes air, in other words towards the
                                radiator. The extra cooling tubes may
                                have reduced the clearance between the
                                radiator and the fan. There isn't much
                                clearance to begin with. The combination
                                of the two may have been enough for the
                                fan to hit the radiator.</div>
                              <div><br clear="none">
                              </div>
                              <div>The other issue is what caused the
                                overheating. At high speeds the fan has
                                little to no effect on cooling. Unless
                                the ambient temperature was very high
                                and you were going up a steep hill the
                                colling system should keep up. What was
                                the water temperature gauge saying?</div>
                              <div><br clear="none">
                              </div>
                              <div>Harold</div>
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