When I turn my a/c on it blows hot air and the fans don’t run. ", "Suggestion about the AC compressor clutch helped, thank you. I checked for leaks, and it doesn't have any. Sure, if the fuse that feeds your AC compressor or relays is blown and not delivering +12VDC you will have no AC. Turning the system off for a while and letting it thaw will temporarily solve the problem. If you have no leak and a fully charged system but only hot air then it could be the compressor, a relay, orifice tube clogged or another component. Electrical Issues. The first thing to be affected will be the heater core — since it is higher than the engine, there might not be enough coolant to reach it. Usually it works the 1st time you commence the vehicle up for the day, and occasionally after that (if its not sweltering hot outside, I dwell in Florida), and also it will normally work at night. Checked for incoming resistance ground to the blower, from the dash control switch and it works. If it is not spinning, you have a problem with your compressor. Blend doors change position when the temperature selection is changed, blocking the flow or permitting the flow of either hot or cold air. I'm have a radiator leak on top, but I don't know if it's cracked. What could be the issue? The hoses going to the heater core r hot under the hood and they r hot in the cabin. ", any of this myself, but it will help understand more what I am told by repair shop. See a technician for advice. When a car heater doesn't work, the most common cause is low coolant. To create this article, 17 people, some anonymous, worked to edit and improve it over time. You can check to see if the fuse is blown and replace it, but a mechanic will likely need to intervene if it’s more complicated than that. % of people told us that this article helped them. ", "Good explanations. ", "When I go to have my AC checked, I will have a lot more info. wikiHow is a “wiki,” similar to Wikipedia, which means that many of our articles are co-written by multiple authors. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/d\/d8\/Diagnose-a-Non-Working-Air-Conditioning-in-a-Car-Step-1-Version-7.jpg\/v4-460px-Diagnose-a-Non-Working-Air-Conditioning-in-a-Car-Step-1-Version-7.jpg","bigUrl":"\/images\/thumb\/d\/d8\/Diagnose-a-Non-Working-Air-Conditioning-in-a-Car-Step-1-Version-7.jpg\/aid947911-v4-728px-Diagnose-a-Non-Working-Air-Conditioning-in-a-Car-Step-1-Version-7.jpg","smallWidth":460,"smallHeight":259,"bigWidth":"728","bigHeight":"410","licensing":"
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\n<\/p><\/div>"}. Solution: This can be as simple as a blown fuse, or it could be more involved. Look for oily residue on or around hoses that attach AC components together. Checked the blower with direct power and it works. The heater, however, is a different story. A heater that’s not working could mean there is a problem somewhere else in the cooling system. To create this article, 17 people, some anonymous, worked to edit and improve it over time. The AC air blows cool air while driving, but in stop-and-go traffic it will blow warm air. Ac/heat blower fan not working, randomly turns on and off. If my AC compressor breaks, can I still drive the car? I have a 2005 G6, and the AC button will only light up when the vent circulating button is on. The AC works fine, front and back. Can u please tell me what the problem of s. My car does not over heat. Checked for battery at the blower, when the car is running. My heater is not that hot on the driver side and on the passenger side car in t is cold. This article has 23 testimonials from our readers, earning it our reader-approved status. 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: How a car’s cooling system works. 2004 Nissan Maxima ABS, SLIP, VDC OFF And BRAKE Lights Are On. It's probably water vapor, not smoke. This article has been viewed 1,398,749 times. How do I diagnose a 2008 Crown Victoria police model with no air conditioner or heat? This button also won't turn off unless the fan is not on at all, and there is not cold air blowing for the AC. I am hoping someone can shed some light on my issue. Wear safety glasses and work in an open environment, where fumes won’t overwhelm you. It only blows hot air on 3 and 4. If it doesn’t, try searching online for “replace cabin air filter” followed by the year, make, and model of your car (for example, you might search for “replace cabin air filter for 2006 Toyota Camry”). If that’s the case and you don’t get it fixed, you could wind up with a major repair expense, or worse… an engine that needs to be replaced. Here is what to check if your heater or defroster isn't working: Coolant/Air lock - Did you top off the coolant as described above? Can a blown fuse box cause your AC not to work? While you may be getting hot coolant/antifreeze into the heater core, the heater fan, the part that actually blows the heat into the cabin, can break or suffer an electrical short. If it isn't it could be that the heater control valve is not working and needs to be replaced, or on older cars a physical flap which alters the path of the air could be broken, or disconnected from the controls. A loud noise (or bad smell) coming when the heat or air are running could be a sign of this problem. Unless it smells or doesn't dissipate, don't worry about it. It is always best to consult a professional to do repairs to your vehicle. 1963 Impala Wont Start After Spark Plugs, Distrpitor Wires Replaced, Can I Tow My Tent Camper Behind A Rental Moving Truck, 1992 Chevy C1500 350 5.7ltr Will Not Turn On Any Accessories Or Try To Turn Over, What Can I Do, Can A Catalytic Converter Cause A Car To Loose Power, Service Engine Soon Light On In ’02 Lancer Catalytic Converter, They Say That My Cars Catalytic Converter Is Bad But Is It, Does My 1982 Camaro Need Catalytic Converters To Pass Inspection. ", "Good step by step, easy to understand guide! If the engine is overheating or low on coolant the air conditioner will be weak or not work at all. You are also less likely to be taken advantage of at a repair shop if you already know why your AC is not working. With the A/C on, gently wiggle the cord to test for a short in the adapter. ", auto mechanic myself, just wanted more information. Why is the Heater Not Working? Oily spots may indicate a refrigerant leak. ... After a month without a car (too cold outside to work on it) and much online searching, testing of fuses, resistors etc etc a Honda mechanic my grandson knew suggested to him that it most likely was the whole heating unit that was blown. Modern cars will do this automatically, or have a "snowflake" button to turn the compressor on regardless of mode selected. Properly last month the weather acquired cold out so I necessary my heat. ", "It has explained all the issues that may be wrong with the air. Last Updated: October 22, 2020 What could be wrong? Include your email address to get a message when this question is answered. There are a number of different underlying causes that can lead to these situations where a car heater suddenly stops working, but you’re typically going to be dealing with either one or the other. I have a 2009 Flex. By using our site, you agree to our. I have a 1994 Honda Accord and the ac in my car does not work. What could be wrong with it, and how much would it cost to repair? If you do find a leak, you will likely need to hire a professional to repair the leak. Need help please. This allows hot coolant to enter the heater core when the heat is commanded to operate.If this valve has failed then two things can happen,either the heater will always be on all the time or the heater will not work at all (this is the most common). I've check he fuses they all look ok, the fluid level is ok. Even if you’re missing a little coolant from the system, the engine can still run at the correct operating temperature. There could even be a puddle of liquid under the front of the vehicle. relays is under the hood Ken Mattson, owner of Len’s Automotive in Bellevue, Wash., says a car heater can stop working for a number of reasons, including: • A low antifreeze/water level in the radiator due to a leak in the cooling system. Collecting Initial Information Turn the air conditioning on while the car is running. Check to see if your AC clutch is engaging. It made it so nice, and I could understand it way easier. The compressor looks like a small motor with a large wheel on the end. Very informative, thank you. ", "It helped me know what look at before taking the car to a garage. I've put coolant in it, and it works for a few seconds, then stops. Learn more... Driving around on a hot day in a car without a working air conditioner can be uncomfortable and even dangerous in extreme heat. someone. 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