The thermostat was replace 2 years ago with a higher temp thermostat. Not to say it couldn't be bad, but I did have this problem last year too.
I can cool the engine with the heater blasting, haha.
There are vent slots on the underside of the bumper cover that let air in if the coolant fan turns on, and I am running an indicator light that tells me when the fan turns on. It rarely turned on the summer (only the warmer commute home in the afternoon), so in winter I'm quite sure it'll never come on.
I think I might try insulating the engine itself. Ideas on that would be great.
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