But if your car heater blows cold air and you’ve checked both heater core hoses to make sure they’re hot, you likely have a bum blend door actuator. What could the problem be? Share this conversation. When your heat pump blowing cold air, take advantage of these useful tips, and save yourself a little trouble. Don't panic if you see frost on your outside equipment's coil. It was working fine and then suddenly it started blowing cold air rather than hot. Why Is My AC Heater Unit Blowing Cold Air? What could the problem be? The most common causes of your air conditioner not providing cool air are a dirty air filter and a damaged condenser coil. Air Is Blowing, but It Isn't Cold If you can feel air blowing from your air conditioner, it means the fan is working, but the condenser may not be. If your thermostat is staying open then it won't get hot in the cab,if the heater is bad,it will leak and fog up the window,another cause could be the blend door is stuck close,or the valve is stuck close and antifreeze can;t circulate thru the heater core.When you first start your car does the thermometer on dash go up then cone down,if it is then thermostat is good. When you air conditioner operates in heat mode, air flow generated by the fan will pass over / through these coils thereby heating the air blown into the room in which the unit is located. Check all of the blend doors and make sure that they are working. Frost on the outside coil is condensation that forms up on the coil in the form of frost. We have a Kenmore Heating and Air conditioning window unit (model #5807287200). If not, your system may have a valve problem, a refrigerant charge issue, or a compressor problem. Heat Pump Troubleshooting Problem #3: BLOWING COLD IN HEAT MODE. I was told that it has like a thermodor or something like a heater strip that sometimes needs to be replaced. Temperature Control. Because it illustrates just one of many reasons why a heater might blow cold air, and an air conditioner might blow hot air. Ft, Heat, White Ft, Heat… Get shopping advice from experts, friends and the community! A: This problem is a lot more common than you may think and the solution is probably a lot simpler than you’re probably imagining. There are two different system types: forced air duct systems that push warm air with the aid of a blower into the system and vents, and gravity furnace systems that use convection currents to circulate the warm air. The reason the fan shuts off during this process is so the system doesn't pull the cold air from the outside across the coil while the hot refrigerant circulates. The transition from a liquid to a gas sucks heat out of the air, and as a result, the evaporative coils turn cold. A circulation fan blows this cold air out of the front of the unit. You start it up and hit the heater. To improve ventilation, windows can also be opened (partially if it’s cold). A new door actuator costs less than $100. Anybody had any issues with these? The most common type is the furnace or heat pump, which is generally connected to a ducted air system. Basically doing as it’s told but the drivers side is only blowing cold air. Why does the front window defroster blow only cold air. Here’s how. Most problems with window and room air conditioners can be categorized under a few symptoms: they do not cool sufficiently, they do not turn on at all, or they make noise. If the valve is stuck closed, that may also answer the question, is your Toyota car heater blowing cold air. A dirty air filter can block air flow and cause a unit to stop working. 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