ac works but no heat in car

the ac works great but no heat 1 Answer. Heater control valve When you set the temperature to hot, air being passed over the heater matrix should be ducted into the cabin. i have a 2008 chevy cobalt. AC works fine, but when I turn the nob to red zone with the AC off I get no heat in the car. Reasons Why a Car Heater Stops Working There are a few reasons why a car heater may be on the fritz—it depends on the nature of the problem. A fan blows over this heater core and the warmed air enters the cabin. the ac works great nice and cold but when I switch it to heat it still blows cold. Your car’s heating and cooling system uses the coolant to move heat from the engine into your car’s heater core. Your engine runs by turning a mixture of fuel and air into a series of tiny explosions, so naturally, this process generates a lot of heat—so much so, that your vehicle must also have a cooling system to prevent it from overheating. But today the heat seemed to stop working all together. If cold air is coming out of the heating vents, even when the vehicle is warmed up and the thermostat is set to hot, you could be dealing with one of the following problems: A cold winter day is no time to find out your car heater isn’t working. The air in my car hasn't worked in a couple of years but the heat always worked...very well at that. I'm not sure what fuse is associated with the heat as its not labeled as such. If there is no coolant it can’t work… This blog post will give you a good idea of what might be causing the problem with your car heater. That’s small radiator sort of thingy hidden behind the engine. Your car’s heater uses heated engine coolant to warm the air that is blown into the cabin, while the air conditioner uses a compressor driven by the engine, combined with both high pressure and low pressure lines, special refrigerant and many other components. How the Heating System Works . I assume the blower motor is still working, but what can be the cause of the heat going out suddenly? Nothing but cold air was blowing through the vents...it never warmed up. There are any number of reasons cold air or no air is coming through the vents. AC works fine but I have no heat. Best answer for Why Does My Air And Heat In My Car Only Work Sometimes. Top Reasons Central Heat doesn’t Work. I was told to check the fuse and/or check the passenger side to see if there's water ( heater coil issue) no water on floor. It's a 2003 Saturn L300. Your car's heating system is not all that complicated. it is not switching to heat. While both the heating and AC are connected - to an extent - within your car, they’re actually separate systems. 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