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Can starting your car in very cold temperatures with the heater on affect your engine?
Gavincox1982
No. The heater uses hot engine coolant that is run through what is effectively a small radiator. If the coolant is cold because the engine hasn't yet warmed up, then you are just circulating COLD water through the heater... no harm there.
But SOMETIMES the defroster switch also activates the air conditioning system to dry out the air that is blown across the windshield. If the defroster is on when you start the engine it MAY cause the engine to idle a little fast and if the engine doesn't run well in the cold it may contribute to engine stalling. Beyond that, again, no harm there.
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