The heater blows cold air in cold weather.
In very cold weather a vehicle may need more time to heat up before hand to help start the car efficiently. In some cases old or low coolant levels can affect the ability your vehicle has to produce sufficient heat. A cooling system diagnostic can be performed to ensure that the cooling system holds system pressure and to make sure that there are no leaks. If your thermostat is stuck open, the coolant is constantly recirculating and never gets to heat up.
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