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Old 01-01-2017, 09:59 PM
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wristwister wristwister is offline
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OK folks, the next chapter of the Tartan's running-too-cool saga:

I popped out the thermostat, it's definitely the single-acting with the bypass, but the bypass has no restrictor valve. The thermostat was pretty gunky, and closed. I did the vinegar soak, cleaned it up, and tested, opening at 160 just as it should. It definitely wasn't stuck open and likely was working fine.

So ... any ideas why the engine is running so cool? Could it be because there's no restrictor in the bypass loop? This would be weird, because it's been running at ~180 for the last few years, and then one day last summer it just started running cool, going no higher than 120. Ideas?
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