![]() ![]() Seals can also get loosened with time which results in water leakages. The radiator hose can crack or damage with time. Water leak issues can affect the vehicle’s heating and cooling system. You can take the car to the nearest professional service, and they will repair or replace the blend door. But sometimes, the blend door might be completely broken, in which case you must replace it completely. If this is the issue, you can fix it easily. As a result, the heater will blow cold air.Īgain, there can be a problem with the blend door actuator. Sometimes, it gets jammed, which causes warm air to not come inside the car. The blend door is the door that allows the warm air from the heater core to flow around the car’s cabin. The heater core might break with time which can result in this issue. There may be a problem with the heater core as well. Sometimes radiator hoses can get cracked or loose and cause the coolant to leak. If you have recently filled the coolant reservoir and the car heater is blowing cold air, you need to check for leaks. So, once you get a low coolant indication on the dashboard, you should always open the coolant reservoir and add coolant immediately during the winters. ![]() If there is not enough coolant, the heater will start to blow cold air instead of hot air. The car heating mechanism entirely depends on whether the levels of coolant are sufficient. Low coolant LevelĪs described above, the coolant plays a significant role in providing warm air inside the car. Once the coolant level is low, you must add coolant to the car.Īdditionally, the radiator and heater core must be kept neat and clean to remove the engine’s heat effectively.Īlso read: 4 reasons why F150 interior lights won’t turn on and what can you do about it? Why is My Heater Blowing Cold Air? #1. So, you need to check the coolant levels from time to time. It will only work effectively if the coolant is in an appropriate amount. One thing you must understand is that a car’s heating system greatly depends on the coolant. When it cools down sufficiently, it is again pumped back into the engine. A blower motor uses the hot air produced by the hot coolant inside the heater core, thus heating you up.Ī valve regulates the flow of coolant inside the heater core. The heater core is a heat exchanger mounted just under the car’s dashboard. The coolant goes from the radiator into a mini radiator or heater core. When you feel cold and want the car heater to work, the car uses some part of the coolant to blow hot air inside. It is then pumped by the water pump, where the coolant will be directed back to the engine head and piston. Once the coolant reaches the desired temperature(200 degrees Fahrenheit), the thermostat valve opens, and the warm coolant moves to the radiator for cooling. It continuously moves around the engine’s components to prevent it from overheating. The rest of the heat is transferred to the coolant.Ĭoolant is a fluid that helps run the engine at an ideal temperature. Most of the heat goes away through the exhaust valve. The engine can become overheated if it is run continuously. It has an internal combustion engine, which produces a lot of heat energy because it burns an air-fuel mixture. ![]() (Photo shows controls, with headlights on, dimmer at max.A car heater helps keep you warm when the outside temperature is cold or windy.Ī car naturally produces heat when it is running. The only other thought I had was if those bulbs were in series with the bulbs behind blower switches, and headlight switch illumination! This has plagued me for 3 years, and it’s high time I figure out what’s keeping it from working! I pulled the bezel off the dash, and checked the 2 bulbs behind the climate control knobs. I’ve checked every fuse in the passenger compartment fuse-panel, (#10 was blown, but replaced), and I’ve visually checked every one of the fuses in the fuse-box under the hood. But I get no illumination behind these switches/knobs no matter what I do. Dimmer control works for the radio lights and cluster lights. (And also the illumination behind the blower speed knobs, and headlight switch/knob and dimmer switch) All instrument cluster lights work, radio lights work, power outlets work, all switches work. I replaced the fuses and all was well except the illumination behind my climate control knobs. Wife put jumper cables on backwards 3 years ago, and blew a couple of fuses. ![]()
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