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ac works but no heat in car

Nothing but cold air was blowing through the vents...it never warmed up. the ac works great nice and cold but when I switch it to heat it still blows cold. A cold winter day is no time to find out your car heater isn’t working. There are any number of reasons cold air or no air is coming through the vents. 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. Heater control valve When you set the temperature to hot, air being passed over the heater matrix should be ducted into the cabin. How the Heating System Works . A fan blows over this heater core and the warmed air enters the cabin. 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. it is not switching to heat. 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. In most central, ducted systems, there are two distinct units which cool and heat residential homes: the air conditioning unit, which typically is placed outside, and, the furnace, which generally is located in the garage or another out-of-the-way place inside the home. I assume the blower motor is still working, but what can be the cause of the heat going out suddenly? 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. This blog post will give you a good idea of what might be causing the problem with your car heater. 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: While both the heating and AC are connected - to an extent - within your car, they’re actually separate systems. the ac works great but no heat 1 Answer. i have a 2008 chevy cobalt. Best answer for Why Does My Air And Heat In My Car Only Work Sometimes. The air in my car hasn't worked in a couple of years but the heat always worked...very well at that. But today the heat seemed to stop working all together. AC works fine, but when I turn the nob to red zone with the AC off I get no heat in the car. Your car's heating system is not all that complicated. AC works fine but I have no heat. I'm not sure what fuse is associated with the heat as its not labeled as such. That’s small radiator sort of thingy hidden behind the engine. If there is no coolant it can’t work… Top Reasons Central Heat doesn’t Work. 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