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<p>Are you sure the thermostat it working correctly? You didn't
mention it.</p>
<p>CR<br>
</p>
<div class="moz-cite-prefix">On 1/29/2021 8:12 PM,
<a class="moz-txt-link-abbreviated" href="mailto:rolindsay@yahoo.com">rolindsay@yahoo.com</a> wrote:<br>
</div>
<blockquote type="cite"
cite="mid:5a7d7848-6dd0-4fb3-897e-0dd38a95db02@email.android.com">
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<div dir="auto">Hello friends. I haven't written to bother you
for a long time, but now I do so because I need advice. My
recently resurrected '72 MGB's engine runs hot. It doesn't
boil over but it 'overheats'. Here are the details from two
tests.</div>
<div dir="auto"><br>
</div>
<div dir="auto">1972 MGB, idling from cold start, bonnet open,
50:50 antifreeze mix, heater valve open, new water pump,
flushed radiator, 10# radiator cap, timing set correctly,
air:fuel ratio set correctly, carbs balanced.</div>
<div dir="auto"> </div>
<div dir="auto">First day tests, w/o electric fan on:</div>
<div dir="auto"><br>
</div>
<div dir="auto">Time</div>
<div dir="auto">Since Coolant Gauge</div>
<div dir="auto">Start Temperature Reading</div>
<div dir="auto">-----------+‐-----------------<wbr>---+--‐----------</div>
<div dir="auto">
<div dir="auto">0 min 71°F minimum</div>
<div dir="auto">1 min 72°F minimum</div>
<div dir="auto">5 min 160°F 1/4 scale</div>
<div dir="auto">10 min 195°F 5/8 scale</div>
<div dir="auto">15 min 220°F 7/8 scale</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto">
<div dir="auto">Second day tests, with electric fan on:</div>
<div dir="auto"><br>
</div>
<div dir="auto">Time</div>
<div dir="auto">Since Coolant Gauge</div>
<div dir="auto">Start Temperature Reading</div>
<div dir="auto">-----------+‐--------------------+--‐----------</div>
<div dir="auto">0 min 63°F minimum</div>
<div dir="auto">1 min 64°F minimum</div>
<div dir="auto">5 min 159°F 1/4 scale</div>
<div dir="auto">10 min 195°F 5/8 scale</div>
<div dir="auto">15 min 228°F edge of 'H'</div>
</div>
<div dir="auto"><br>
</div>
</div>
<div dir="auto">Conclusions:</div>
<div dir="auto">1. Engine starts easily, idles smoothly, and
runs great.</div>
<div dir="auto">2. No boil over in either test case.</div>
<div dir="auto">3. Electric fan 'on' cannot overcome whatever is
causing the car to run hot.</div>
<div dir="auto">4. Temperatures measured at top of thermostat
housing, but verified to be the same at the radiator top neck.</div>
<div dir="auto">5. Charge is neither lean nor rich.</div>
<div dir="auto">6. Timing is set correctly.</div>
<div dir="auto"><br>
</div>
<div dir="auto">What product might I use to flush debris from
the block and head, if that is indeed the problem? Thoughts?
And thanks.</div>
<div dir="auto"><br>
</div>
<div dir="auto">-Rick, in Houston, TX</div>
</div>
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