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What thermostat do you have? Sounds like it's stuck open, or you have something like a Nismo that opens at a low temp.
When the ambient temp is really low, it'll be nearly impossible to raise the temp above the thermostat opening point. 65C is roughly 140F, which is what I see some of these low temp thermostats advertised. If that's what you have, put a stock 180F thermostat in there.
Normal operating temp range should be 180-210F. Not a cool 140F.
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