The most common cause of a heater blowing cold air is a bad thermostat. The thermostat opens and closes to regulate coolant flow. A thermostat typically opens when the coolant temperature is at 195 degrees Fahrenheit; if... More »

The most common causes of an automobile heater blowing cold air relate to the heater core. This unit is a small radiator the manufacturer installs inside the cabin of the vehicle behind the dash. A fan blows air through ... More »

If the defroster is unable to blow hot air, there may be a clog in the cooling system or a malfunction of one of the actuators for the vent doors. The cooling system and actuators will need to be properly inspected to fi... More »

The most common cause of a heater and air conditioner blower not working on a car is a faulty blower motor. Without the blower motor, the system is unable to push air through the vents inside the vehicle. More »

The most common causes of an automobile heater blowing cold air relate to the heater core. This unit is a small radiator the manufacturer installs inside the cabin of the vehicle behind the dash. A fan blows air through ... More »

The advantages of fitting your car with a cold air intake are increased horsepower, increased toque, increased throttle response, increased fuel economy and prolonged engine life. Another benefit of a cold air intake sys... More »

www.reference.com Vehicles Car Parts & Maintenance

An electric heater might blow cold air because the thermostat is set too low or is not working properly, the air has not had enough time to warm up yet or there is leaky or blocked duct work. Most of these are easily det... More »