3. The part of your AC that’s frozen is the evaporator coil.It blocks cool air from entering your home. Whether it’s in your house or car, when you’re ready for the cool refreshing AC, hot air blowing in your face can be unbelievably frustrating. Questions? Take care of it now. The first thing to check is the levels of Freon in the system. Cooling fans are not the sturdiest components in a modern vehicle. Many of these wires are also obscured by other automotive parts. Addressing blockage often requires flushing of the system by a trained AC technician. If your air conditioner is blowing warm air, or just not working properly, it is best to schedule service ASAP to maximize your comfort. My AC is only blowing through the defrost vent and the temperature control doesn't do anything. Car heater problems are also frequently associated with heater core difficulties: coolant may not be traveling through the heater core properly, the air from the blower motor is not reaching it or there’s a clog in the small tubing of the heater core. The air conditioner won’t run properly unless your engine is running. This is a substance that provides the means upon which the system can get rid of excess heat and provide the necessary element for cooling the passenger compartment. The refrigerant passes into a part called compressor, which pumps it. You can inspect those wires that you can reach. We curate, you discover! But, pinpointing the exact reason … Since a leak causes a reduction in pressure within the system, a liquid refrigerant can turn into gas almost in an instant. If it’s now giving you cool air, you’re all done. Air conditioners can freeze solid into a block of ice, a common reason for your AC blowing hot air. Other possibilities include a faulty compressor, broken cooling fans, or an issue in your electrical system. The main job of the condenser is to remove heat from the liquid refrigerant coming from the compressor. There can be couple of reasons for the air conditioner to blow hot air. Within your car, the AC system is sealed and … Would you still like to change your location? There is an inexpensive, fast, easy fix. Refrigerant is a liquid that circulates through your car’s A/C system, expanding and contracting as it removes heat and humidity from the cabin. Symptoms of a Bad or Failing AC Pressure Switch, The Best Cabin Air Filters (Review) in 2020, The Best Car Air Fresheners (Review) in 2020, Help us to show you How did that happen? Start with the fan speed turned to its highest setting. We mentioned above that the condenser often has a pair of cooling fans in front that aid in the removal of heat from the liquid refrigerant. Air Conditioner Freezing. Call It can be because of the compressor problem, or a problem in getting required amount of refrigerant. Due to its complicated design, compressor failure can be attributed to contamination or other failed parts within the system. It was blowing cold just yesterday! Why is Your Car AC Blowing Hot air? products! If an account exists, an email will be sent with further instructions. There are exceptions. products you will love. This leads to a loss of its fundamental function. Your vehicle should have a complete relay diagram showing the location of all of the vehicle's electrical components such as … As it reaches the compressor, it gets pressurized and turns into liquid form. Refrigerant is a liquid that circulated through the AC system and remove heat from the inside of your car. There are some things that you can do to help prolong the life of your vehicle's compressor. You might even have a combination of both problems, with your car blowing air around the cabin (in this case your feet) and moving the already hot air around. This is often the case. Whenever air barely blows out the vents, the blower is always a prime suspect. It was added by the dealer. Starting it shocks the system and can hasten the speed of its deterioration. Once it’s switched, try your AC again. Thankfully, in this article, we’ll review each of these car AC problems in detail. Hot liquid refrigerant stays hot. The heater core may also leak coolant. 1-800-PEP-BOYS (737-2697) When it is not, which of course occurs on the most brutally hot day of the year, the A/C suddenly becomes a cruel joke, blowing warm, stale air into your vehicle. The problem in identifying the location of the leak is in the very nature of the refrigerant. Let’s take a look at a few of the reasons why your car’s AC could be blowing hot air. A refrigerant leak is unique in the sense that refrigerant evaporates instantly into a gas once it isn't under the pressure of your closed loop A/C system. For example, before you go tearing apart the ventilation system in your car, it can be smart to check the AC lines under the hood. Many different things can go wrong here causing the whole system to work poorly or not at all. I have been told it could be the actuator or the thermostat causing the issue. Air compressor could be hitting a wall. Electrical Issues Without the proper test equipment and, perhaps more importantly, the experience level of the individual diagnosing the problem, these issues are difficult to isolate. Your air conditioning system uses a refrigerant, a compressor, an expansion valve and two heat exchangers to manage air flow and cool the air inside the cabin of your vehicle. Our Glossary will help you learn automotive lingo and better understand each terminology. When it is working properly, your cars' air conditioner is a wonderful thing. As you can see, refrigerant has the uncanny ability to turn into a gaseous state the moment it meets an area of less pressure or resistance. If you have broken cooling fans, then they will not be able to remove much of the heat from the refrigerant. Learn how your comment data is processed. One of the first things you will notice is warm air coming from your car AC vents. The first is a blockage anywhere in the series of tubes in the condenser. Troubleshoot these common car air conditioning system problems. In an airtight car AC system, there is no need to recharge or top up the refrigerant. This heater core then passes the hot air it generates into the vehicle with a blower fan. Take note that a clogged condenser is just a contributing factor to why the car air conditioning blows hot air and not blowing cold air. None of the other A/C components will … In fact, here in Columbia, MD we are expecting the temperature to hit the 90’s this week. If your air conditioner is blowing warm air, or just not working properly, it is best to schedule service ASAP to maximize your comfort. When Freon starts to get low, the A/C can start intermittently blowing out cool air—particularly when it reaches a certain speed—and blowing hot air at other times. Automotive A/C systems have certain intricacies in their design that render them difficult to repair without the proper equipment and knowledge base. You know that there’s a problem but what could be causing your AC to blow hot air? If you believe your AC is having issues, bring your car in to a trained and experienced auto repair technician to diagnose what exactly is behind your cooling woes. If the condenser is already broken, there is nothing left to do than to replace it with a new one. If there is no leak, it is still possible to break the condenser altogether. You probably just need to recharge your a/c. As it goes out of its canister, it is often in a gaseous state. Another possibility is that the blower will only operate at its … If your car has a “Max AC” setting, select that option. The condenser looks like a smaller version of the radiator. Car is its own language—luckily, we’re fluent. The best setting for diagnosis is “fresh air” (not recirculated) with the air blowing out of the center vents in the dash and the AC turned on. The motor is what’s providing the heat if the fan isn’t frozen as well. The most common cause of an AC system blowing warm air is a lack of refrigerant, though, you may also have a problem with your condenser. I'd guess that the AC is screwed up, if it does that, or else there's some little switch or the thermostat is messed up that is telling the heater to turn on instead of the AC. The A/C system in your car has a maze of wires complete with fuses, relays and pressure switches that work in unison to provide safe operation under normal operating conditions. One has to follow the wires from the fuse box all the way to the individual AC components. If your car’s air conditioning system is blowing hot air, don’t sweat it out. This allows the liquid to “cool” down before it converts again into gas as it moves through the rest of the AC system. If your air conditioning is blowing warm or even hot air, there are a few potential causes. Here are some of the most common reasons. If this doesn’t solve the problem, then having an auto electrician identify the electrical issue can help. Return vents closed or blocked. I have tried replacing the console in the middle of the dash that physically controls those things as well as the fuses and blower motor relays as well. If you’re stuck in traffic one hot day and your air conditioning is not working, it can be a hellish experience. The different components that run the car AC system requires electricity to operate. A/C isn’t cooling? Firstly, your air compressor could be hitting a wall. When it isn’t, driving in your car can be uncomfortable, especially on hot summer days. We are unable to add items to your cart from two different locations. Another reason why your air conditioner is only blowing warm air is because the condenser is broken. We've identified three common A/C System issues to help supply you with information on what may be going on with your vehicle. First, make sure to run the compressor for about 10 minutes once a month in the off season, regardless of the temperature outside. A refrigerant is a special kind of gas (but compressed to liquid) that gives the unit its cooling ability. Low Refrigerant Levels The most common cause of hot air coming from car AC vents is low levels of refrigerant. Related article: Why and how to change an air filter. How Does a Car Air Conditioning System Work? The first reason why your AC isn’t blowing cool air is because it needs a freon recharge. The main problem is a refrigerant leak in which you need to replenish the system with enough amount of refrigerant after the leak is repaired. Reasons Why Your AC Is Blowing Warm Air. Here’s another air flow issue that can result in your AC blowing warm air. Similar to many other car parts, the compressor can wear out over time. Without it, it would be impossible to move the refrigerant. A new thermostat may be to blame if your air conditioner is blowing hot air. Yet the problems that can cause an auto AC to perform in such a way tend to be the same problems. Right in front of it is a pair of cooling fans that help to remove the heat from the liquid refrigerant. The other problem is related to a broken condenser. Your passengers will thank you! One of the main reasons why a compressor may fail is if it was not used for a very long time. We have just sent you an email. It can also be due to a problem in the condenser, the compressor, the cooling fan, or the electrical system of your car. When there isn’t enough freon, the air conditioner’s clucth won’t come on, which will also affect the compressor from cycling. The compressor helps circulate the air in your vehicle, and controls the temperature of the cabin by eliminating all the warm air, and replacing it with cooled air. There are other potential reasons why your AC is blowing hot air, but these are the most common problems car owners run into. This site uses Akismet to reduce spam. 1-800-PEP-BOYS (737-2697), We are here for our customers, Team Members and neighbors. Another way is to stop in to Pep Boys for a FREE A/C Quick Check (not available in the state of California) and an associate can give a visual inspection of the compressor to ensure that everything looks in order. If there is insufficient refrigerant circulating in the car AC system, then it will not be able to get rid of the excess heat. The refrigerant is the soul of the AC. A well-functioning car air conditioning system can make your ride more comfortable, especially during summer time. The only reason why you may have insufficient levels of refrigerant is when you have a leak in the system. If one of these electrical components fail due to age or defect, the system is designed to shut itself down to prevent damage to itself or unsafe conditions for the operator. You can browse by letter, or simply enter a keyword into the search bar. When it is working properly, your cars' air conditioner is a wonderful thing. There are several reasons why your AC might be blowing hot air. It’s that time of year again. A refrigerant leak can also occur in the. Leaks in your A/C don't result in the normal tell tale puddles of fluid under your vehicle like those of an oil or antifreeze leak. A puncture in any of the tubes of the condenser can lead to a leaking refrigerant. The heater core is clogged from debris in the cooling system. We will email you instructions to reset it. Air conditioner blowing hot air after replacing the thermostat. On top of that, there are certain environmental concerns involved with refrigerant that require special attention. The fans could actually be broken, like a burnt out motor, bad mount a chipped fan blade, or they could simply have an electrical problem like a blown fuse or burnt out relay. Do not expect the air do be cold, however. You will still get air flow through the AC vents in the passenger compartment because of the fans in this section. When it is not, which of course occurs on the most brutally hot day of the year, the A/C suddenly becomes a cruel joke, blowing warm, stale air into your vehicle. If there are signs of damage, it is possible to mend the wires. If the refrigerant level is low then there is a leak that needs to be addressed. The days are getting hotter. Like having a blocked condenser, having broken cooling fans can cause a lack of cooling at your condenser and could cause your car AC blowing hot air. It can occur anywhere in the connections or hoses of the system. A car’s a/c system is a sealed system. In most cases, it's due to a loss of refrigerant in the system. This is a substance that provides the means upon which the system can get rid of excess heat and provide the necessary element for cooling the passenger compartment. This is easy to in most modern vehicles since they utilize the compressor when the defroster, which is used year round, is activated. No problem! 7. This makes it quite challenging to determine where the leak is. They can crack if hit by a road debris. Which means that they blow what ever air is selected. Therefore, it is possible that your car is low on refrigerant that is preventing your air conditioning from working properly. In particular, the blower motor may be failing or the blower wheel may be slipping from the blower motor shaft. Because of the weight on the car, the compressor malfunctions. The point is that ordinary vehicle owners will have a hard time determining the exact location of the leak. © 2020 The Pep Boys – All Rights Reserved. As such, you can expect the air flow in the passenger cabin to be hot, too. It can also occur in the compressor, the condenser, or the evaporator. Our certified technicians are trained to search for much less sinister signs of leaks like the oily residue which might be found on or around A/C hose units or connections. Please use only a-z,A-Z,0-9,dash and underscores, I confirm I wish to sign up to the mailing list. The compressor is the heart of your vehicle's air conditioning system. Kitchenistic helps you find the latest and gratest Other potential causes of a problem in the cooling fan are a blown fuse and some other electrical problem. Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air. From here, the refrigerant turns into a gaseous state again before reaching the evaporator. The Refrigerant is Leaking. Hence, only a professional car air conditioning technician can help solve the problem. A car A/C blowing hot air is often the result of a refrigerant leak. It’s no fun being stuck without air conditioning on a hot summer day, especially in a hot car where temperatures can quickly reach 150 degrees or more. Even though all these things make it very difficult for a vehicle owner to understand why their AC is blowing hot air, there are some things you can check easily to help narrow down what the problem might be. There are two main issues in the condenser that can lead to a car AC system blowing hot air. The primary reason for which car ac is blowing hot air is when the air conditioner of the car is on it draws a load of power from the engine of the car. If you haven’t had your system maintained in a while and your AC is blowing warm air, the next step is to check your air filter, and change it if needed. The air you get inside the car is not as hot as a faulty condenser, however. Heater cores, in a nutshell, are cooling system parts that resemble compact radiators. 6 Reasons Why Your Car’s Air Conditioner Might Be Blowing Hot Air. If debris has caused a clog in the heater core, it will need to be replaced. Any time a system in your car … This is because there is no space for the refrigerant to escape and evaporate. Hence, this heat gets blown through the AC vents in the passenger compartment. One way to keep your compressor in tip-top shape is by running your AC on full blast for 10 to 15 minutes once a month, regardless of the ambient temperatures outside. See the steps we are taking. Armed with that info, let’s explore how you got into this mess. The only recourse for cracked cooling fans is to replace it. Having your car air conditioner blowing hot air can be one of the most frustrating problems to have. Considered as the heart of the modern car AC system, the compressor is what drives the refrigerant throughout the series of tubes, hoses, and interconnected devices. A/C systems are sealed and therefore don't require refrigerant top-off's. I had a 1980 Ferrari that did not come stock with AC. If you could tell me if you feel a LOT of heat at your feet now, or if there is a lot of hot air coming out of the vents near your feet I might be able to help narrow it down. The air feels warm. Its function is to circulate refrigerant through a series of Onlines that allow it to remove heat from your vehicles cabin. Hot air coming from your car AC vents can mean that you have low levels of refrigerant. If your air conditioner is blowing warm air, or just not working properly, it is best to schedule a service ASAP to maximize your comfort. It is still enough to make you sweat, nevertheless. The most common cause of hot air coming from car AC vents is low levels of refrigerant. Your AC Refrigerant is Leaking If your car AC is blowing hot air, it is very likely that the refrigerant in the unit is low. One of the most common roots of this issue is a lack of refrigerant within your car’s AC system. If the heater control valve is the culprit, the air coming into your vehicle won’t feel warm. It then enters the condenser where the liquid refrigerant gives off excess heat. Most cars do not have AC vents, only climate control vents. Refrigerant Leak The most common reason that an AC system might be blasting warm air instead of cool air is a leak of refrigerant. Your air conditioner is great—when it’s working well. The Front Blower Motor Relay (also known as the AC Relay), located behind the junction block with a black connector, B05, is the culprit. The problem is that it is not always easy to diagnose an electrical problem. The Best Car AC Refrigerants (Review) in 2020. First, don’t panic. When it is not, which of course occurs on the most brutally hot day of the year, the A/C suddenly becomes a cruel joke, blowing warm, stale air into your vehicle. Any degree of blockage in the system can lead to the condenser not being able to execute its principal function. 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