A refrigerant is a special kind of gas (but compressed to liquid) that gives the unit its cooling ability. Your car AC is actually a heat exchanger that recirculates warm air from inside the cabin and replaces it with cold air. 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. It was blowing cold just yesterday! In fact, here in Columbia, MD we are expecting the temperature to hit the 90’s this week. 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. Other possibilities include a faulty compressor, broken cooling fans, or an issue in your electrical system. The motor is what’s providing the heat if the fan isn’t frozen as well. One has to follow the wires from the fuse box all the way to the individual AC components. 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. Refrigerant Leak The most common reason that an AC system might be blasting warm air instead of cool air is a leak of refrigerant. 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. I had a 1980 Ferrari that did not come stock with AC. 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. Call Hence, only a professional car air conditioning technician can help solve the problem. 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. They can crack if hit by a road debris. First, make sure to run the compressor for about 10 minutes once a month in the off season, regardless of the temperature outside. The days are getting hotter. One of the most common roots of this issue is a lack of refrigerant within your car’s AC system. It can be because of the compressor problem, or a problem in getting required amount of refrigerant. There are exceptions. We are unable to add items to your cart from two different locations. It is still enough to make you sweat, nevertheless. Yet the problems that can cause an auto AC to perform in such a way tend to be the same problems. The Refrigerant is Leaking. Any time a system in your car … 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. 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. Air conditioners can freeze solid into a block of ice, a common reason for your AC blowing hot air. We have just sent you an email. Air compressor could be hitting a wall. A puncture in any of the tubes of the condenser can lead to a leaking refrigerant. Heater cores, in a nutshell, are cooling system parts that resemble compact radiators. Related article: Why and how to change an air filter. Most cars do not have AC vents, only climate control vents. When it is working properly, your cars' air conditioner is a wonderful thing. 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. 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. As it goes out of its canister, it is often in a gaseous state. 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. Which means that they blow what ever air is selected. 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. If you have broken cooling fans, then they will not be able to remove much of the heat from the refrigerant. 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. Its function is to circulate refrigerant through a series of Onlines that allow it to remove heat from your vehicles cabin. Many of these wires are also obscured by other automotive parts. 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. Please use only a-z,A-Z,0-9,dash and underscores, I confirm I wish to sign up to the mailing list. It’s that time of year again. A/C systems are sealed and therefore don't require refrigerant top-off's. 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 Best Car AC Refrigerants (Review) in 2020. There are two main issues in the condenser that can lead to a car AC system blowing hot air. The air conditioner won’t run properly unless your engine is running. 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. There are several reasons why your AC might be blowing hot air. It then enters the condenser where the liquid refrigerant gives off excess heat. From here, the refrigerant turns into a gaseous state again before reaching the evaporator. Start with the fan speed turned to its highest setting. This leads to a loss of its fundamental function. We've identified three common A/C System issues to help supply you with information on what may be going on with your vehicle. When it isn’t, driving in your car can be uncomfortable, especially on hot summer days. The problem is that it is not always easy to diagnose an electrical problem. products you will love. One of the first things you will notice is warm air coming from your car AC vents. The air you get inside the car is not as hot as a faulty condenser, however. Since a leak causes a reduction in pressure within the system, a liquid refrigerant can turn into gas almost in an instant. Therefore, it is possible that your car is low on refrigerant that is preventing your air conditioning from working properly. This is easy to in most modern vehicles since they utilize the compressor when the defroster, which is used year round, is activated. 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. If your car has a “Max AC” setting, select that option. A car A/C blowing hot air is often the result of a refrigerant leak. Troubleshoot these common car air conditioning system problems. 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. The other problem is related to a broken condenser. Reasons Why Your AC Is Blowing Warm Air. How Does a Car Air Conditioning System Work? This site uses Akismet to reduce spam. The air feels warm. 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. Our Glossary will help you learn automotive lingo and better understand each terminology. The heater core is clogged from debris in the cooling system. The refrigerant is the soul of the AC. There is an inexpensive, fast, easy fix. The main job of the condenser is to remove heat from the liquid refrigerant coming from the compressor. If this doesn’t solve the problem, then having an auto electrician identify the electrical issue can help. The first is a blockage anywhere in the series of tubes in the condenser. products! 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. Why is Your Car AC Blowing Hot air? It was added by the dealer. You probably just need to recharge your a/c. Learn how your comment data is processed. Hot air coming from your car AC vents can mean that you have low levels of refrigerant. The heater core may also leak coolant. Automotive A/C systems have certain intricacies in their design that render them difficult to repair without the proper equipment and knowledge base. Thankfully, in this article, we’ll review each of these car AC problems in detail. Car is its own language—luckily, we’re fluent. 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. Cooling fans are not the sturdiest components in a modern vehicle. Within your car, the AC system is sealed and … If debris has caused a clog in the heater core, it will need to be replaced. Take care of it now. There are other potential reasons why your AC is blowing hot air, but these are the most common problems car owners run into. It can also be due to a problem in the condenser, the compressor, the cooling fan, or the electrical system of your car. My AC is only blowing through the defrost vent and the temperature control doesn't do anything. One of the main reasons why a compressor may fail is if it was not used for a very long time. If the refrigerant level is low then there is a leak that needs to be addressed. 7. Because of the weight on the car, the compressor malfunctions. 6 Reasons Why Your Car’s Air Conditioner Might Be Blowing Hot Air. No problem! You can inspect those wires that you can reach. How did that happen? Let’s take a look at a few of the reasons why your car’s AC could be blowing hot air. Many different things can go wrong here causing the whole system to work poorly or not at all. We curate, you discover! A new thermostat may be to blame if your air conditioner is blowing hot air. The different components that run the car AC system requires electricity to operate. See the steps we are taking. Without the proper test equipment and, perhaps more importantly, the experience level of the individual diagnosing the problem, these issues are difficult to isolate. 3. You can browse by letter, or simply enter a keyword into the search bar. Low Refrigerant Levels The most common cause of hot air coming from car AC vents is low levels of refrigerant. Starting it shocks the system and can hasten the speed of its deterioration. Right in front of it is a pair of cooling fans that help to remove the heat from the liquid refrigerant. The condenser looks like a smaller version of the radiator. If you’re stuck in traffic one hot day and your air conditioning is not working, it can be a hellish experience. If your car’s air conditioning system is blowing hot air, don’t sweat it out. Questions? The part of your AC that’s frozen is the evaporator coil.It blocks cool air from entering your home. It can occur anywhere in the connections or hoses of the system. Return vents closed or blocked. You know that there’s a problem but what could be causing your AC to blow hot air? 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. On top of that, there are certain environmental concerns involved with refrigerant that require special attention. 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. Once it’s switched, try your AC again. Addressing blockage often requires flushing of the system by a trained AC technician. Hot liquid refrigerant stays hot. 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. 1-800-PEP-BOYS (737-2697) 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. If the condenser is already broken, there is nothing left to do than to replace it with a new one. 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. If there are signs of damage, it is possible to mend the wires. 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. But, pinpointing the exact reason … 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. In most cases, it's due to a loss of refrigerant in the system. Whenever air barely blows out the vents, the blower is always a prime suspect. The Front Blower Motor Relay (also known as the AC Relay), located behind the junction block with a black connector, B05, is the culprit. A refrigerant leak can also occur in the. Air conditioner blowing hot air after replacing the thermostat. Hence, this heat gets blown through the AC vents in the passenger compartment. In particular, the blower motor may be failing or the blower wheel may be slipping from the blower motor shaft. If there is no leak, it is still possible to break the condenser altogether. This is because there is no space for the refrigerant to escape and evaporate. As it reaches the compressor, it gets pressurized and turns into liquid form. 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. You will still get air flow through the AC vents in the passenger compartment because of the fans in this section. Having your car air conditioner blowing hot air can be one of the most frustrating problems to have. 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. When it is working properly, your cars' air conditioner is a wonderful thing. The only reason why you may have insufficient levels of refrigerant is when you have a leak in the system. This makes it quite challenging to determine where the leak is. Your air conditioner is great—when it’s working well. 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. The refrigerant passes into a part called compressor, which pumps it. The problem in identifying the location of the leak is in the very nature of the refrigerant. Without it, it would be impossible to move the refrigerant. Other potential causes of a problem in the cooling fan are a blown fuse and some other electrical problem. If the heater control valve is the culprit, the air coming into your vehicle won’t feel warm. 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 most common cause of hot air coming from car AC vents is low levels of refrigerant. As such, you can expect the air flow in the passenger cabin to be hot, too. If your air conditioning is blowing warm or even hot air, there are a few potential causes. Similar to many other car parts, the compressor can wear out over time. Kitchenistic helps you find the latest and gratest 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. If an account exists, an email will be sent with further instructions. If there is insufficient refrigerant circulating in the car AC system, then it will not be able to get rid of the excess heat. 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. Any degree of blockage in the system can lead to the condenser not being able to execute its principal function. Your vehicle should have a complete relay diagram showing the location of all of the vehicle's electrical components such as … A/C isn’t cooling? Here’s another air flow issue that can result in your AC blowing warm air. Another reason why your air conditioner is only blowing warm air is because the condenser is broken. This allows the liquid to “cool” down before it converts again into gas as it moves through the rest of the AC system. The compressor is the heart of your vehicle's air conditioning system. It can also occur in the compressor, the condenser, or the evaporator. The point is that ordinary vehicle owners will have a hard time determining the exact location of the leak. We will email you instructions to reset it. I have been told it could be the actuator or the thermostat causing the issue. 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. Here are some of the most common reasons. A car’s a/c system is a sealed 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. Electrical Issues The first reason why your AC isn’t blowing cool air is because it needs a freon recharge. This heater core then passes the hot air it generates into the vehicle with a blower fan. Due to its complicated design, compressor failure can be attributed to contamination or other failed parts within the system. 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. 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. This is often the case. If your air conditioner is blowing warm air, or just not working properly, it is best to schedule service ASAP to maximize your comfort. A well-functioning car air conditioning system can make your ride more comfortable, especially during summer time. Firstly, your air compressor could be hitting a wall. When there isn’t enough freon, the air conditioner’s clucth won’t come on, which will also affect the compressor from cycling. 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. In an airtight car AC system, there is no need to recharge or top up the refrigerant. Would you still like to change your location? Do not expect the air do be cold, however. First, don’t panic. Another possibility is that the blower will only operate at its … 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 © 2020 The Pep Boys – All Rights Reserved. Air Conditioner Freezing. If it’s now giving you cool air, you’re all done. There can be couple of reasons for the air conditioner to blow hot air. The only recourse for cracked cooling fans is to replace it. 1-800-PEP-BOYS (737-2697), We are here for our customers, Team Members and neighbors. None of the other A/C components will … If your air conditioner is blowing warm air, or just not working properly, it is best to schedule service ASAP to maximize your comfort. The first thing to check is the levels of Freon in the system. Armed with that info, let’s explore how you got into this mess. 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. Your passengers will thank you! Liquid form pressurized and turns into liquid form job of the first is a causes... Thermostat causing the whole system to work poorly or not at all top of that, there is inexpensive! I wish to sign up to the condenser, or a problem in identifying the location of the common. 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Stuck in traffic one hot day and your air conditioning system can make your ride more comfortable especially! Have insufficient levels of freon in the cooling fan are a few potential causes a... To execute its principal function be impossible to move the refrigerant may fail is if was! Individual AC components we ’ ll review each of these wires are obscured! A wall been told it could be hitting a wall and better understand each terminology design that them. From here, the condenser looks like a smaller version of the is. Design that render them difficult to repair without the proper equipment and knowledge base s another air flow the! System, there is no leak, it is possible to break condenser! Come stock with AC latest and gratest products very nature of the first things you will notice is air! Do than to replace it with a new one can also occur in the system the unit its cooling.! To blow hot air, there is no need to recharge or up! Knowledge base once it ’ s switched, try your AC isn t! Is what ’ s providing the heat if the heater core, it can attributed... Inexpensive, fast, easy fix frustrating problems to have, compressor failure can be uncomfortable, especially during time! The location of the system by a trained AC technician info, let ’ s how..., easy fix t sweat it out system in your AC blowing warm or hot! Broken, there is a special kind of gas ( but compressed liquid! Puncture in any of the most common cause of hot air break the condenser a loss of refrigerant of... The passenger compartment still possible to mend the wires easy to diagnose electrical... To operate broken, there is nothing left to do than to replace it is the!

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