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Originally Posted by saltfish
Isn't there a thermostat bypass on most cars that allows a portion of the coolant to pass through the heater core before the thermostat reaches sufficient temperature to open?
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Depends on the car. Most have an vacuum actuated valved that so when you turn it on warm the valve opens up and the car is supplied with water. If yours does have this, turnint the heat and the fan off will help it warm up faster. It's just the reverse if your cars overheating you should turn on the heat.