Subject: Re: [Healeys] radiator thermostat

From: Ken via Healeys <[email-masked]>
Date: Wed, 17 Sep 2025 14:32:56 -0700

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From: Hank Leach via Healeys <[email-masked]>
Date: Wed, 17 Sep 2025 22:47:29 +0000 iLlRS6M/IsYAB71NJS9AwtIN67dVwSzhjZbH+00OhspGXQAtbH/rW5U55a7y8QfcOtz3dE3LOjMJ1z/ymbWSadHi6AlVXLnPVJ1UU2cezOg3a/OoUC/Glqhq kaXyKCu8AYtdmBH9u4sQ5j7RY+bFizqrmK7dSqvqBVjtCzjcFxN3c2oUO4e6IWrL

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<div>I would like to comment about the position of the temperature "sensor"=
 found in the Healey. All of them-100s and 3000s measure the =
water/antifreeze temperature <span style=3D"text-decoration: =
underline;">flowing thru the radiator</span>. That is not necessarily the =
temperature of the engine itself. Using a heat detector gun (Harbor =
Freight) you can actually see the head, block and exhaust readings and they=
 will be different than the degrees indicated which has been read in the =
water flowing and transferred down a long capillary tube to an analog gauge=
.</div>
<div>&nbsp;</div>
<div>In contrast, most older American cars, and =
incidentally the Jensen-Healey, measure the temperature of the manifold, or=
 the block, by electronic sensor to an analog gauge.</div>
<div>&nbsp;</div>
<div>I'm sure todays' vehicles have more accurate =
measurements, but they don't tell us what that actual number is unless an =
icon illuminates on the dash indicating a problem with temperature. I guess=
 that ancient type of measurement is what gives the Healey its charm. Be it=
 Fahrenheit or Centigrade. Hank</div>
<div><br>-------------------- =
<br><br>From: "Harold Manifold" &lt;[email-masked]&gt; <br>To: "Richard=
 Mayor" &lt;[email-masked]&gt; <br>Cc: "Richard Antal" =
&lt;[email-masked]&gt;, "Healeys" &lt;[email-masked]&gt; =
<br>Sent: September 17, 2025 at 3:05 PM PDT <br>Subject: Re: [Healeys] =
radiator thermostat </div>
<div>
<div>Hi All,</div>
<div>&nbsp;</div>
<div>Thermostats always generate interesting discussions.</div>
<div>&nbsp;</div>
<div>I use a 180-degree thermostat in my car. However, =
what's equally important is how effectively the thermostat regulates the =
coolant temperature. A thermostat that is fully closed or fully open is no =
longer actively controlling the temperature. The normal operating range is =
typically the opening temperature plus 20 degrees. For example, a =
165-degree thermostat should maintain the temperature between 165 and 185 =
degrees, while a 180-degree thermostat should keep it between 180 and 200 =
degrees.</div>
<div>&nbsp;</div>
<div>If your current thermostat maintains =
the coolant temperature within its specified range under normal driving =
conditions, then it's the correct one for your needs.</div>
<div>&nbsp;</div>
<div>Harold</div>
</div>
<div>&nbsp;</div>
<div class=3D"gmail_quote gmail_quote_container">
<div =
class=3D"gmail_attr">On Wed, Sep 17, 2025 at 1:36=E2=80=AFPM Richard Mayor =
&lt;<a href=3D"mailto:[email-masked]">[email-masked]</a>&gt; =
wrote:</div>
<blockquote class=3D"gmail_quote" style=3D"margin: 0px 0px 0px=
 0.8ex; border-left: 1px solid rgb(204,204,204); padding-left: 1ex;">
<div>165 is too cold for good running.&nbsp; Our engines run better in the =
180 to 190 range. &nbsp;
<div>&nbsp;</div>
<div><br>
<div>
<div>Sent from my iPad</div>
<div><br>
<blockquote>On Sep 17, 2025, at =
12:13=E2=80=AFPM, Robert Markovich via Healeys &lt;<a =
href=3D"mailto:[email-masked]" target=3D"_blank" =
rel=3D"noopener">[email-masked]</a>&gt; wrote:<br><br></blockquote>
</div>
<blockquote>
<div>165 is the one I use<br><br><br>
<div><a style=3D"font-size: 12px;" href=3D"https://aolapp.onelink.me/eG2g?=
pid=3DNativePlacement&amp;c=3DUS_Acquisition_YMktg_320_EmailSignature_Attri=
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_ios_store_cpp=3Dce85ce34-ad0f-4811-a92b-a172743b064e&amp;af_android_url=3D=
https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.aol.=
mobile.aolapp%26listing%3Demail_signature_attribution" target=3D"_blank" =
rel=3D"noopener">Sent from the all new AOL app for iOS</a></div>
<br>
<p style=3D"font-size: 15px; color: rgb(132,115,255); padding-top: 15px; =
margin-top: 0px;">On Wednesday, September 17, 2025, 2:50 PM, Richard Antal =
via Healeys &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank"=
 rel=3D"noopener">[email-masked]</a>&gt; wrote:</p>
<blockquote>
<div id=3D"m_3862331438548245316yiv6324880639">
<div>
<div style=3D"font-family: 'Helvetica Neue',Helvetica,Arial,sans-serif; =
font-size: 13px;">
<div>Gents,</div>
<div>&nbsp; &nbsp; &nbsp;What is the =
desired coolant temperature for optimal engine performance? I've searched =
the tech articles and can find nothing that specifically answers that =
question. This summer my BJ8 seemed to run fine with a 160 thermostat which=
, according to the gauge which I've checked and found to be accurate, kept =
the coolant at around 165. Thanks to all who respond.</div>
<div>rich antal</div>
</div>
</div>
</div>
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