Question about 1990 Mazda MX-5

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MX5 overheating conundrum

My 1.6 Eunos has been as good as gold for 60,000 miles then .... driving along at motorway speeds I noticed the temperature needle shifting up the wrong end of the scale - first time ever it's moved. I stopped and had a look under the hood. Nothing. No leaks. No steam. Fan spinning as normal. Now here's the thing, I blipped the throttle to look for any pressure related leaks like the head gasket... didn't see that, but the temperature went down. Noticed the same thing on the drive home. Steady speeds and the temperature went up, rev the engine and the temperature dropped back to normal. Rather the oppsotive to what you'd expect. Confusing or what? Any ideas?

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Reving the engine increases the fan speed cooling the radiator more check your thermostat it is stuck closed

Posted on Jul 20, 2009

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