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My Insight suffers from this as well. The engine even has exhaust heat recovery - there's a water jacket over the exhaust. When it's below freezing and I turn on cabin heat, I start losing coolant temperature, nevermind when it's 20 below zero. Cabin air recirculation helps but then my windows fog up. A 100% grille block helps, but isn't enough. Pre-warming the engine helps, but doesn't stop it from cooling back off after I'm driving.
And before you ask, my thermostat is fine, it's only when running heat.
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