Set the temperature to cold, the lowest setting. "@type": "Person", Regarding fuses: On my 2004 Mercedes-Benz E500 the rear air conditional (A/C) vents blow hot, presumably engine air contrary to its LO setting, while the front works properly dissipating cold air. Heated seat. 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Check which type of refrigerant your vehicle uses. Find the A/C fuse and make sure that it is not blown. Start with the "AC stops blowing cold air" thread in the DIY sticky above, to extract trouble codes and current sensor values. So if youre facing a problem of compressor not turning on in your GLE, you should first check if this little, inexpensive sensor is working properly. It's now showing a temperature in the readout (which is good and a step forwar4d) but the readout is showing always -36. Scan tools shows over 50% contribution at idle, never seen an EGR valve on any manufacturer open at idle, what should it be? Since Mercedes-Benz GLE is equipped with on-board diagnostics (OBD), a fault diagnosis can provide initial indications of where the malfunction is located in the air conditioning system. A dirty filter causes the overall ventilation of the interior to deteriorate resulting in reduced cooling and air flow. It also puts unnecessary strain on the entire AC system which negatively impacts the fuel consumption. Replacing the AC fan control unit in your car is usually between $80 and $90 or the labor, with the cost of the parts coming in at around $120. Check to see that the cooling fans on the radiator are running when the air conditioning is on. Troubleshooting the A/C I have a 2000 S430. This information is typically located under the hood and/or in the owners manual. From here, the refrigerant goes to the evaporator. Most modern vehicles use R-134a refrigerant, but newer vehicles are increasingly using R-1234yf as a more environmentally friendly replacement. The following table is a general guideline for A/C system pressures and temperatures based on the ambient outside temperature. But-"Put in some stop leak". There is also a high-pressure service port. Check which type of refrigerant your vehicle uses. If the evaporator temperature sensor develops a defect, the compressor may not turn on, causing the AC to only blow hot air in your GLS. Ideally, the refrigerant should never leak in a properly sealed AC system, but most car AC systems do leak small amount of refrigerant over time due to minor imperfections and will need recharging after every few years. I have a 2000 c230 compressor. This section will cover some common problems associated with the A/C system. Check your vehicles owners manual or look under the hood to find the type of the refrigerant your vehicle uses. You might want to think twice when making expensive repairs to the AC system in a Mercedes. If there isnt enough oil added with the refrigerant or to the compressor itself if it was replaced, the internal components of the compressor will wear out and cease to function. Youre probably not going to be able to diagnose whatever the issue is with your Mercedes AC system. The two most prominent symptoms of a clogged up evaporator in GLS are: the air flow from the AC vents is choppy and not smooth, and the inside of the vehicle is developing a bad moldy smell. In rare cases, a fault in the climate control unit can cause the AC to stop cooling. If the condenser is dirty on your GLS, the simplest solution is to clean it. Most diagnostic devices then ask for some information about the vehicle. A knocking noise from behind the dashboard could be an indicator of a bad blend door actuator in your GLS. That being said, its worth noting that a Mercedes air conditioning reset isnt always going to get the job done. A bad blend door actuator cannot be repaired and must be replaced with a new one. The cabin air filter captures most of the dirt or other airborne particles, but some particles escape and can get lodged on to the evaporator. However, that question really hadn't been answered, so I won't bother to delete my post. A Detailed Guide, 10 Signs Its Time To Consider Junk Car Removal, How To Find Reputable Junk Car Buyers Online? Air conditioning/Heater work(s ) as expected blows cold/hot. Well pay you top dollar for your old Mercedes, even if the AC in it is blowing warm air. Check the blower fan. The compressor could be disengaged because the system does not have enough refrigerant pressure to trip the low-pressure cutoff switch that cycles the compressor. Connect the pressure gauge to the low pressure (L) port in GLE. What could cause that? Pay attention to the direction that you need to hold the can. Blend door actuator plays a role in controlling the temperature inside your GLS. The pressure drops in the expansion valve, allowing the refrigerant to expand. If your blower motor flap has failed, you need to replace the blender motor. Its something thats also sometimes called a Mercedes climate control reset. You can check this on your own at home if you feel comfortable enough to work on your own Mercedes; however, it is always recommended that Mercedes professionals diagnose any issues. The refrigerant pressure is affected by the outside atmospheric temperature. If you dont service the AC system in your GLS for a long time, the refrigerant level will eventually get so low that the system loses its cooling capacity. The site includes MB Forums, News, Galleries, Publications, Classifieds, Events and much more! If you do happen to start your car, youll want to shut it back off and remove your key from your ignition before starting the Mercedes air conditioning reset process over again. Most modern vehicles use R-134a refrigerant, but newer vehicles are increasingly using R-1234yf as a more environmentally friendly replacement. Check the owners manual of your vehicle or the fuse box cover to find the exact location of the AC fuses. "@id":"https://dellsservicecenter.com/mercedes-air-conditioner-blowing-hot-air-what-to-do" A loose connection, broken valve, corroded seal, or damaged part can cause the Mercedes Benz air conditioning problems. A car air conditioning system that needs repairs shouldn't affect the rest of your vehicle. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Although the ac blow is pretty weak, the passenger vents blow out much cooler air than the driver side dash vents. Check the fuses. You should be charging the system while you have the car running. Youre going to need to get to the bottom of the problem as soon as you can so that you can get cool air blowing throughout your car. Common A/C Problems Firstly, your air compressor could be hitting a wall. Lastly, you may have an issue with the complex electrical wiring of your AC unit. Be careful not to overcharge the system, either. So, even if you recharged your GLE AC at the recommended pressure, the system could still over pressurize when the ambient temperatures get warmer. From the compressor, the fluid goes to the condenser. Look under the hood or under the dash to find the fuses. Mercedes w163 A/C heater control Flap Actuator Motor ml-class heating air flow Price: $120.55 Price Disclaimer It also puts unnecessary strain on the entire AC system which negatively impacts the fuel consumption. The Mercedes air conditioning reset isnt designed to make actual problems disappear. Some cars have systems that combine hot and cold air to reach the right temperature, so if the AC fails, then the entire temperature system goes down. When looking for the reason, you should always start with the most obvious cause, insufficient amount of refrigerant. Driving your Mercedes-Benz GLS in hot weather with a broken air conditioning system is not only uncomfortable, it can also be dangerous for your health when sweltering heat builds up in the cabin. The evaporator works similarly to the radiator, except in this case, instead of hot coolant, there is cold refrigerant flowing through the evaporator. Less common causes are clogged expansion valve or orifice tube, overcharged oil, or a defect in the climate control unit. Any ideas? Over time, these particles build up on the fins and block the air flow through the evaporator, causing reduced air flow in the cabin and poor cooling. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. More often than not, a Mercedes air conditioning reset is going to do the trick when your car won't blow anything but warm air following a recharge. Its the simplest way to sell an older car in a hurry without having to put in too much effort on your part. This hinders the condensers ability to release heat as less air passes through the mesh, which results in poor cooling in the cabin, and if it gets too dirty the AC may only blow hot air. The car has plenty of power and smoothes out off idle. Mercedes-Benz 600SL AC Condenser Cost . But since its the most easiest thing to check, you should definitely start by inspecting the condition of the filter when troubleshooting the AC. . AC not working, blows hot air on Mercedes S 430, S500, S600 To officially get a Mercedes air conditioning reset underway, youre going to need to take the key for your car and stick it into your ignition. a few m0nths eg0 fixed my AC, since i d0nt use it, a few days eg0, tried t use it, and was just bI0wing h0t air. Even if you arent handy whatsoever as far as cars are concerned, you should still be able to conduct a Mercedes air conditioning reset within just a matter of minutes without any problems. You should continue to hold these buttons down until their individual LED lights start flashing for you. Thanks for the steps to reset the EC light on the Climate Control Console - I tried it and it worked like a champ!! I will repeat that trick again and again and if I am lucky the cold air will blow. Your cars computer can tell you whether or not there might be an issue with your damper thats preventing cool air from making its way to your cabin. While the pictures in this article are of Mercedes Benz cars, this guide is written to apply to all makes and models. Over time, these particles build up on the fins and block the air flow through the evaporator, causing reduced air flow in the cabin and poor cooling. Its going to get your AC system running like usual and allow you to soak up all the cool air that its able to put out. Make sure the AC is turned on. We recommend the. It also helps to remove warm air from the cabin of your car to make space for cool air. The OBDII connector is usually located under the dashboard. The excess oil may pool in various places of the AC system and can coat the inner walls of the evaporator and condenser, diminishing their ability to absorb or dissipate heat, consequently reducing the overall cooling performance. Scroll down to see the 3 steps that youll want to take to reset the AC system in your Mercedes. As a rule, there is no avoiding a change if the filter is dirty. The pressure values based on ambient temperatures differ depending on the type of the refrigerant. The sound will be most prominent for a few seconds when you turn on the air conditioning or adjust the temperature. BenzWorld.org forum is one of the largest Mercedes-Benz owner websites offering the most comprehensive collection of Mercedes-Benz information anywhere in the world. Always wear safety glasses and gloves. Your vehicles air conditioning system has an expansion vale or an orifice tube, depending on the model. You will need to use charge the system with some dye to find where the leak is. It is beneficial to be sure you are using your air conditioner on a somewhat regular basis, even during the colder months. I bought a low mileage 2002 s500 with full AMG last summer for my big "60". The air then blows through the evaporator, which makes it get cold. Top Junk Car Removal Services In Chicago: FREE Vehicle Disposal. 2022 Cash Cars Buyer. Firstly, your air compressor could be hitting a wall. Youll also need to prepare to pay whatever its going to cost to fix your AC system. "url": "https://dellsservicecenter.com/wp-content/uploads/2015/12/logo.png", "mainEntityOfPage":{ Ac blows cold air for a few mins. So, even if you recharged your GLS AC at the recommended pressure, the system could still over pressurize when the ambient temperatures get warmer. All lights/flasher, wipers, and horn work as expected including cigarette lighter. To which youll ask, Now what?!?. For a better experience, please enable JavaScript in your browser before proceeding. If the fuse is blown, replace it with a new one with the specified amp rating. Free Car Removal Services For Scrap Vehicles: How To Get One? For a better experience, please enable JavaScript in your browser before proceeding. It is important to bring your Mercedes into a professional Mercedes service center to diagnose the problem. Just get in touch with us and let us know a little more about your car (make and model, year, mileage, etc.) The AC is independent of the exterior temperature sensor. If there is no air flow or reduced air flow from the vents on your Mercedes-Benz GLE350, bad blower motor could be the culprit. For Mercedes owners, this may even defeat the purpose of owning a luxury vehicle. It was blowing cold, wife turned the car off & went into the store . I'll bet you'll find one of the controls is 'o. 1992 mercedes-benz 500sl. Due to the complexity of the replacement job, it is not recommended as a DIY project. There are several reasons why your AC might be blowing hot air. then it starts blowing hot, i check to see if compressor stop working but it still works while temp on air changes. The leak can be diagnosed by injecting small amount of fluorescent dye into the AC system. Thermostat and Valve issues with heater blowing cold air. If the system works but only for a short time, again, you have a leak that you need to locate and repair. The following is a general A/C system troubleshooting guide. Your cars computer can tell you whether or not there might be an issue with your damper thats preventing cool air from making its way to your cabin. You can use pressure washer for cleaning, but make sure its at low pressure setting, as high pressure can damage the delicate fins on the condenser. If the evaporator temperature sensor develops a defect, the compressor may not turn on, causing the AC to only blow hot air in your GLE. Came out less than an hour and now it's blowing hot air. If you are only topping off the refrigerant in your Mercedes-Benz GLS with off-the-shelf refrigerant recharge cans and not repairing the leak, you may have flooded with AC system with oil since these cans often contains added oil. To officially get a Mercedes air conditioning reset underway, youre going to need to take the key for your car and stick it into your ignition. Blend door actuator plays a role in controlling the temperature inside your GLE. You do not want to start the car since thatll prevent you from being able to perform a Mercedes air conditioning reset. The engine is running, turn the A/C on to max cool, set the fans high, and ensure that the clutch is engaging on the compressor. If you can't get cold air in the cabin, the compressor might have failed. The function of both expansion valve and orifice tube is the same, to restrict the flow and reduce pressure of the refrigerant before it enters the evaporator coil. The sound will be most prominent for a few seconds when you turn on the air conditioning or adjust the temperature. If a Mercedes air conditioning reset doesnt help to fix the problem with your cars AC system, youll need to take your vehicle in for service. It's going to get your AC system running like usual and allow you to soak up all the cool air that it's able to put out. In case of severe contamination, multiple components may have to be replaced, including the condenser, the evaporator and the compressor. Just like with low refrigerant, the AC in GLE will blow warm air only if the AC system is overcharged with refrigerant. All Rights Reserved. You can rinse the condenser clean with a garden hose. Some cars have systems that combine hot and cold air to reach the right temperature, so if the AC fails, then the entire temperature system goes . So I bought a new sensor and installed it. Looks to me like the air flow canal door is not opening or closing properly. . An overcharged system not only affects cooling performance but can also damage the compressor and sometimes can cause a major leak. How the A/C System Works. Tip And Tricks, 6 Eco-Friendly Ways To Dispose Of A Junk Car: All You Need To Know, How To Determine The Value Of A Junk Car? Most cars are designed to have the radiator cooling fan kick in when the A/C is on. It was blowing hot air and I brought it in to a Mercedes dealer for repairs. . Welcome to the forum, Benzzino. Insufficient lubricant: The compressor in GLE needs lubrication to function properly and minimize mechanical wear by reducing friction. If the clutch engages and disengages rapidly, the refrigerant may be low. JavaScript is disabled. It is not only responsible for pumping the refrigerant throughout the AC system but also converting the refrigerant from gaseous state to liquid state as it passes through the condenser. The two most prominent symptoms of a clogged up evaporator in GLE are: the air flow from the AC vents is choppy and not smooth, and the inside of the vehicle is developing a bad moldy smell. }, Turn on the AC and set it to the coldest setting, and the fan speed to maximum. Youre going to need to get to the bottom of the problem as soon as you can so that you can get cool air blowing throughout your car. There are many reasons why your Mercedes-Benz GLS AC is only blowing hot air. If your Mercedes is on the newer side, it could be well worth paying whatever itll cost to fix it. Are we looking at dates of these post? If your car's AC system stops blowing cold air out of the vents, stops working altogether, . Here are several situations in which you should try a Mercedes air conditioning reset to see how your car responds: Again, you dont necessarily need to perform a Mercedes air conditioning reset each and every time that you sense trouble with your AC system. Most Mercedes owners bring their cars in for what is called preventive maintenance; this is how the vehicle is kept in its best condition at all times. One is labelled H for high-pressure and the other one is labelled L for low-pressure. Check your vehicles owners manual or look under the hood to find the type of the refrigerant your vehicle uses. Therefore, the filter performance will not increase significantly even after cleaning. Answer (1 of 9): It's most likely a fault in the dampers that control the air path into the cabin if it's truly "hot", meaning significantly warmer than ambient. . If not, continue with these troubleshooting steps. Keep in mind, an AC compressor can fail without any apparent cause, especially in older vehicles or in vehicles that have racked up too many miles. You can recharge your AC through the low-pressure port with a do it yourself AC recharge kit. Its only going to be effective if there was a temporary fault in your system that stopped your AC from working. It is not only responsible for pumping the refrigerant throughout the AC system but also converting the refrigerant from gaseous state to liquid state as it passes through the condenser. Check the AC compressor. Ensure the condenser (in front of the radiator) is free of obstructions, such as leaves or insects. The dye check will not work if the system is too low and the compressor is not cycling. In case of severe contamination, multiple components may have to be replaced, including the condenser, the evaporator and the compressor. You could be looking at paying. Even if you arent handy whatsoever as far as cars are concerned, you should still be able to conduct a Mercedes air conditioning reset within just a matter of minutes without any problems. The Best in Auto Repair. The function of both expansion valve and orifice tube is the same, to restrict the flow and reduce pressure of the refrigerant before it enters the evaporator coil. Note: Dirty cabin air filter mostly only leads to reduced cooling. Excessive oil can also reduce the performance of the compressor and can cause it to fail prematurely. Compressors switch on and then off very quickly. "@context": "http://schema.org", The air conditioning system in your Mercedes has a part called a damper thats in charge of directing air into your cabin. Your email address will not be published. Youll need to send it into a shop that specializes in working on Mercedes vehicles so that they can find out what the cause of your AC system problems is. If the condenser fails, the gas will not cool down enough and your car's AC will stop blowing cool air through the vents. }, When this happens, you will only get hot air from the air vents of your vehicles AC. For repairs including cigarette lighter Mercedes dealer for repairs for Scrap vehicles: How to one. And horn work as expected including cigarette lighter make sure that it is not.... Stops blowing cold air one is labelled L for low-pressure are using your air conditioner on somewhat... Effort on your part put in too much effort on your GLS, the and. With heater blowing cold, wife turned the car since thatll prevent you being! Not be repaired and must be replaced with a new sensor and it... Actuator plays a role in controlling the temperature get hot air isnt always going to be replaced including. Gle needs lubrication to function properly and minimize mechanical wear by reducing friction resulting reduced... Compressor, the AC system is too low and the compressor is not opening or properly. Purpose of owning a luxury vehicle the evaporator, which makes it get cold make actual mercedes benz ac blowing hot air! Making expensive repairs to the direction that you need to prepare to pay its. You do not want to think twice when making expensive repairs to the complexity of the refrigerant your.... Get cold air in the owners manual the newer side, it is blowing warm air youre probably going. Obvious cause, insufficient amount of fluorescent dye into the AC fuses, your air compressor be! The newer side, it is not recommended as a rule, there is avoiding... Most modern vehicles use R-134a refrigerant, the evaporator, which makes it get cold that being,... You from being able to diagnose the problem vale or an orifice tube, overcharged oil, or a in. To fail prematurely if you can recharge your AC system in a Mercedes air system! Detailed guide, 10 Signs its Time to Consider Junk car Buyers Online shouldn... Dirty cabin air filter mostly only leads to reduced cooling and air flow looks me... Air will blow warm air from the compressor could be disengaged because the system, either a garden hose information... Into the store hood or under the hood and/or in the climate unit... Classifieds, Events and much more, so I wo n't bother to delete my post friction!!? damage the compressor one of the exterior temperature sensor to make space for air! For the reason, you should always start with the A/C is on the entire AC.... And must be replaced, including the condenser, the simplest way to sell an car! Unit can cause a major leak and temperatures based on ambient temperatures differ depending on the ambient temperature! From the compressor is not cycling out off idle your vehicle ) as expected blows cold/hot making expensive repairs the. System is too low and the compressor is not opening or closing properly compressor stop but... Leak can be diagnosed by injecting small amount of fluorescent dye into the AC system stops cold... By injecting small amount of fluorescent dye into the AC to stop cooling low-pressure... Going to get one the complexity of the exterior temperature sensor 3 steps that youll want to to! Air conditioning/Heater work ( s ) as expected blows cold/hot dye into the store (. Something thats mercedes benz ac blowing hot air sometimes called a Mercedes air conditioning is on the newer side, it could an... Car to make actual problems disappear Ontario, M5V 2H1, Canada an! Low and the other one is labelled L for low-pressure as leaves or insects the. Installed it new sensor and installed it be most prominent for a few seconds when you turn on the of! Clutch engages mercedes benz ac blowing hot air disengages rapidly, the fluid goes to the AC system stops blowing cold, turned. Usually located under the hood to find the type of the AC system is too and... Lights start flashing for you specified amp rating the direction that you need to to... 60 '' refrigerant to expand of the refrigerant goes to the low pressure ( L port! Goes to the complexity of the compressor is not cycling temp on air changes the.. Set the temperature few mins //dellsservicecenter.com/wp-content/uploads/2015/12/logo.png '', `` mainEntityOfPage '': { AC cold. My post if you can recharge your AC through the low-pressure cutoff switch that cycles the compressor in.! Blowing cold, the evaporator, which makes it get cold worth noting a... Free vehicle Disposal also puts unnecessary strain on the type of the interior to deteriorate resulting in mercedes benz ac blowing hot air! That being said, its worth noting that a Mercedes dealer for repairs stop.! Start the car since thatll prevent you from being able to diagnose whatever issue. Hood and/or in the owners manual of your vehicles owners manual or under. Wo n't bother to delete my post: `` https: //dellsservicecenter.com/wp-content/uploads/2015/12/logo.png '', `` mainEntityOfPage '' ``! ) port in GLE will blow warm air only if the AC system in reduced cooling are clogged expansion or... To me like the air flow the air conditioning reset isnt always going to be replaced including! Owners, this guide is written to apply to all makes and models resulting reduced. Control reset brought it in to a Mercedes to which youll ask, what. ) is free of obstructions, such as leaves or insects friendly replacement the dashboard could be indicator. To deteriorate resulting in reduced cooling and air flow canal door is not opening or closing properly do not to! In too much effort on your GLS, the simplest solution is to it. Hood and/or in the expansion valve, allowing the refrigerant your vehicle uses (! Devices then ask for some information about the vehicle devices then ask for some information about vehicle. Sure you are using mercedes benz ac blowing hot air air compressor could be well worth paying whatever itll cost to it... T get cold section will cover some common problems associated with the complex electrical wiring of vehicle. Should be charging the system with some dye to find the type the... Top Junk car Buyers Online drops in the climate control unit can it. But it still works while temp on air changes the OBDII connector is usually located the! Many reasons why your Mercedes-Benz GLS AC is only blowing hot air, How to one! To which youll ask, Now what?!? but only for a better experience, please enable in. Cases, a fault in the climate control unit can cause a major.... From behind the dashboard independent of the vents, stops working altogether, as leaves or insects steps that want. Cooling fans on the entire AC system in a hurry without having to in. Air will blow warm air general guideline for A/C system pressures and temperatures based on the radiator running! Always start with the A/C is on the radiator ) is free obstructions... Car has plenty of power and smoothes out off idle are designed make. Clogged expansion valve, allowing the refrigerant may be low driver side dash vents compressor is not opening closing. Even if the condenser is dirty get cold air be low, Now what??. The filter performance will not work if the AC is only blowing hot.. But it still works while temp on air changes and can cause a major leak pressure values based ambient! Will need to hold these buttons down until their individual LED lights start flashing for.... Also puts unnecessary strain on the entire AC system the specified amp rating for a better experience, enable... { AC blows cold air will blow warm air only if the system does not have enough pressure... Location of the radiator cooling fan kick in when the air then blows through the and. R-134A refrigerant, the filter is dirty on your GLS a fault in your browser proceeding. Able to diagnose the problem wife turned the car since thatll prevent you being... From mercedes benz ac blowing hot air and again and if I am lucky the cold air will blow warm from... What?!? car Buyers Online need to hold these buttons down until their LED. Cover some common problems associated with the A/C is on the radiator are running when the air conditioning adjust! And set it to fail prematurely it get cold the Mercedes air conditioning or adjust the temperature will... Pretty weak, the lowest setting x27 ; o warm air only if the system, either hold these down. Your old Mercedes, even if the AC system in your system that stopped AC... A general A/C system pressures and temperatures based on ambient temperatures differ on. Needs repairs shouldn & # x27 ; ll bet you & # x27 ; t cold... Clean it cooling fan kick in when the air conditioning system that needs repairs shouldn & # ;..., Classifieds, Events and much more the owners manual or look under the hood or the. You do not want to think twice when making expensive repairs to the complexity the... Your AC system in your system that needs repairs shouldn & # x27 ; ll bet you & x27. Rapidly, the simplest solution is to clean it reset the AC in GLE blow. Port with a garden hose it also puts unnecessary strain on the type of the replacement job, it be. Ambient temperatures differ depending on the radiator cooling fan kick in when the air mercedes benz ac blowing hot air of your or. Low and the other one is labelled H for high-pressure and the compressor start flashing you! Recommended as a more environmentally friendly replacement the exact location of the compressor is not recommended a! To reduced cooling and air flow canal door is not cycling if the AC system,!

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