Re: Heat immediately?
Until the coolant that is held back in the motor by the thermostat warms to its setting lets say 180 degrees you will not get heat. When it opens and allows the heated coolant to flow thru the heater core you have heat. Keep in mind you are heating sort of a cold tin can so it takes awhile to warm up. It was -15 here this morning with a wind chill of -28 so it took along time for my 65 GMC to begin to feel remotely warm.
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