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The engine needs to be getting up to at least 180 I think it is for best operation, running below that does not allow the system to work exactly as designed. So it's best to make sure the thermostat is working as it's supposed to, and that it's the right one. Granted it's going to run colder in the winter, and especially where some of you live (I'm in Mississippi so no worries here), but it should still warm up to a decent operating temperature regardless.
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