Radiator fluid runs through the engine and becomes hot. Add what year, engine, mileage when you get a chance; that will help with the diagnosis. Blower Fan is not working: If your car blower fan is inactive or damaged, car heater will work but warm air will not reach inside of your car. He is also friendly, professional, and extremely honest. Then all of a sudden it started blowing full blast, while the recirc, ac, rear defrost button lights all came on and were flashing...then it all turned off. If the heater isn't blowing any air, skip to the next section. The car's heating system consists essentially of a motor-driven fan to blow warm air from the engine bay to the car's interior. Car Heater Blowing Cold Air: Failed Heater Core. The mechanic checked the fuses. A fan blows over your heater core and directs warm air into the cabin. The AC system is a completely separate entity; the only connection it has to the engine is at the compressor pulley, which derives its power from the crankshaft. If it isn’t, then flushing the heater core will often fix the problem. How to Fix It When Your Car Heater Isn't Working These instructions will help you diagnose and fix a car heating system that only blows cold air. 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. Rotated all the unmarked relays around in the junction box. All components need to be functioning properly for the air to heat the car interior fully. While Las Vegas is known for its hot summers, winter temperatures can drop below freezing at night. Anyway, a blown fuse between an AC and your thermostat is kind of like a bad battery in your car. I took out the fan and hooked it directly to the battery and it worked. Air conditioners and heaters accomplish their tasks unnoticed when working properly. If that piece is not working right, your car could get stuck blowing cool air into the cabin. Low coolant may prevent it from circulating through the heater matrix. LEARN MORE. Car AC Not Blowing or Is Your Car AC Fan Not Working? Other than that, the AC system could care less what the engine is doing. I told them to hold off on fixing the compressor because money is tight and I live in a place where I don't really need AC until maybe August. You should see a valve near the furnace that controls the gas flow. But as soon as they stop working, it's readily apparent. A small amount of hot coolant is diverted into a hose fitted into the firewall and then into a small heat exchanger or heater core. If the heater does not … From there it goes to the heater, which warms it if required. What should my next steps be. There could even be a puddle of liquid under the front of the vehicle. Jeep Commander - Heating AC Inspection - Greensboro, North Carolina, He did a very good job with the inspection and explain everything to my understanding, nice job Leo 5 stars *****. Our certified mobile mechanics make house calls in over 2,000 U.S. cities. The motor that turns the blower is called the blower motor. The problem of the radiator fan not working will cause tremendous damage to the engine and thus must receive immediate attention … Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST. Best of luck. So my car is at a DMC vendor getting worked on. The blower speed can be adjusted in almost every modern car. With the engine running at full temp jack the front of the car up and let it run for 2 minutes then go to the rear of the car and do the same thing, this will burp or purge the air bubbles locked in the heater core and allow the heater to work again. Common Damages That Show Reasons Car AC Not Working 1. He said blower motor might be bad. The last thing you need to worry about during the winter is a malfunctioning heater. This may also explain the hiss you are hearing-probably vacuum actuated doors to change direction of air flow-you just may never have heard this since it would be drowned out by the noise of the fan motor. I hear a hissing sound for about 2 seconds, but no air comes through the vents. He literally saved us thousands of dollars in repair costs. However, if you’re experiencing problems from the HVAC controls, then it’s possible that the same issue will prevent both your air conditioning and heater from working. 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