Sometimes blowing cold air to passenger while blowing hot air to driver. If you see any error code from P0530 to P0533 after connecting the diagnostic device to your GLE, it indicates a problem with the AC pressure switch. "name": "Dells Service Center", Check which type of refrigerant your vehicle uses. This could reduce airflow, resulting in reduced A/C performance. The low-temperature refrigerant passes through the evaporator, which causes the evaporator to get cold. 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. Both of these are at risk of clogging due to contamination, for example due to metal shavings from a failing compressor. "height": 75 Dirty evaporator can also cause GLS AC to blow hot air. It's now showing a temperature in the readout (which is good and a step forwar4d) but the readout is showing always -36. In some vehicle models, cold and hot air are mixed to create the preferred temperature. If you dont service the AC system in your GLE for a long time, the refrigerant level will eventually get so low that the system loses its cooling capacity. Answered by FixItMan in 2 mins 8 years ago FixItMan Auto Mechanic The air conditioning system in your Mercedes has a part called a damper thats in charge of directing air into your cabin. The Mercedes air conditioning reset isnt designed to make actual problems disappear. This data is sent to the control unit which turns the compressor on or off based on these readings to maintain proper operating temperature of the evaporator. A common symptom of a faulty blend door actuator in vehicles with dual zone climate control system is one side blowing hot air while the other side is blowing cold air. This can be a very frustrating problem for many people! To get around this issue, you can turn on the defroster, which automatically uses the AC component. i just did the diagnosis and these are the values i got, this is in celcius. You will need a Recharge Kit to purchase at the local auto parts store or. Asked by Trail1a in Phoenix, AZ on . Note: Dirty cabin air filter mostly only leads to reduced cooling. 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. If the system is low, then start recharging the system using the instructions that came with your recharge kit. 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. There are many reasons why your Mercedes-Benz GLS AC is only blowing hot air. Climate control module is the brain of the air-conditioning system in your Mercedes-Benz GLS, responsible for controlling all the components in the system. The compressors purpose is to add pressure to the system by compressing the refrigerant. 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. 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. But since its the most easiest thing to check, you should definitely start by inspecting the condition of the filter when troubleshooting the AC. 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. Over time, grime, bugs and other small particles can build up on its surface and in the gaps of its mesh. Therefore, the filter performance will not increase significantly even after cleaning. 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. Does someone know what the issue is? Remove the cap from the low pressure service port labelled L, and connect the AC recharge kit. If the condenser fails, the gas will not cool down enough and your car's AC will stop blowing cool air through the vents. If you can't get cold air in the cabin, the compressor might have failed. With the tool connected, turn on the ignition. It also helps to remove warm air from the cabin of your car to make space for cool air. Check all the relevant fuses and relays related to the air-conditioning system in your GLS. Just like with low refrigerant, the AC in GLS will blow warm air only if the AC system is overcharged with refrigerant. "@type": "BlogPosting", 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. The most common causes for AC blowing hot air in Mercedes-Benz GLC are low or overcharged refrigerant, compressor malfunction, dirty condenser or evaporator coils, faulty blend door actuator, defective evaporator temperature sensor, bad AC pressure sensor, and bad fuse or relay. Mercedes-Benz Maybach S580 AC Condenser Cost . Connect the pressure gauge to the low pressure (L) port in GLS. After that, the refrigerant goes through the expansion valve. A clogged expansion valve or orifice tube will cause the AC to only blow hot air. Therefore, the filter performance will not increase significantly even after cleaning. Mercedes Benz Evaporator. . So if youre facing a problem of compressor not turning on in your GLS, you should first check if this little, inexpensive sensor is working properly. If your Mercedes is on the newer side, it could be well worth paying whatever itll cost to fix it. In any case, it is advisable for laypersons to visit a workshop. The Fora platform includes forum software by XenForo. Your Mercedes air conditioning reset should be complete, and your AC system should be working in the way that its supposed to again! On the 1999 E class this is generally a problem when teh freon level is a little low. This is the essential operation of the A/C system, so lets move on to some troubleshooting tips. The sound will be most prominent for a few seconds when you turn on the air conditioning or adjust the temperature. Firstly, your air compressor could be hitting a wall. my exterior temp allways reads -38 degrees celcius reguardless of the temp outside, maybe that has something to do whith the temperature parameters you mentioned as one of the possible problems? A cycling switch may be bad, a fuse may be blown, and the system may not have enough refrigerant pressure to trip the low-pressure cutoff switch that cycles the compressor. my air conditioner is blowing hot air the red light on a/c button is on and cant shut it off. It also puts unnecessary strain on the entire AC system which negatively impacts the fuel consumption. Welcome to the forum, Benzzino. It is 2004 ML 350 Mercedes. But-"Put in some stop leak". Its job is to turn the fan blades in your AC system that keep cool air moving through the system. and well respond with an offer almost on the spot. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The expansion of the refrigerant causes the temperature of the refrigerant to drop. . May just unplugged or maybe the sensor is gone. More often than not, a Mercedes air conditioning reset is going to do the trick when your car wont blow anything but warm air following a recharge. Therefore, it is recommended to do this in a workshop. 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. If the system works but only for a short time, again, you have a leak that you need to locate and repair. Maybe even charge the A/C system if needed. If only hot air comes out of the air vents in your GLE, then the problem probably lies somewhere else. If the reading moves toward the normal range, continue until the system is charged. There is also a high-pressure service port. You do. AC blows out hot air. "datePublished": "2017-07-13", In many models, the AC keeps blowing hot air even after recharging the coolant. Most diagnostic devices then ask for some information about the vehicle. Connect the pressure gauge to the low pressure (L) port in GLE. To get around it, youre going to want to try and do a Mercedes air conditioning reset sooner rather than later. please help its 105 degrees today. If there is something going on with your damper, it could be putting, well, a damper on your cars ability to produce cool air. the AC system in my 2003 Mercedes-Benz is blowing only hot air. 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. Save my name, email, and website in this browser for the next time I comment. If you have low pressure, then check for leaks. One is labelled H for high-pressure and the other one is labelled L for low-pressure. One of the most common complaints of Mercedes users is issues with the air conditioning system. "url": "https://dellsservicecenter.com/wp-content/uploads/2017/07/Mercedes-AC-Blowing-Hot-Air.jpg", The following is a general A/C system troubleshooting guide. Look at the puller, and you should be able to see if it is spinning or not. Note: Dirty cabin air filter mostly only leads to reduced cooling. There are several reasons why your AC might be blowing hot air. why your car might be blowing warm air instead of cool air. The Freon level is adequate , in fact found to be in red zone on a A/C Pro read more Aaron Robert Lead Mechanic & Owner Technical Diploma 25 satisfied customers The a/c is blowing hot air suddenly after having an oil Check out. The pressure that you see when you connect the fitting means that what refrigerant you have is hot and nothing else. Since some OBD codes are manufacturer-specific, the scanner will be able to give you more accurate information if you enter more details about your GLS. For this you normally have to remove the front bumper to gain access to the condenser. Make sure the AC is turned on. Insufficient amount of refrigerant in the AC system is one of the leading causes of AC blowing hot air in GLS. 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. Your AC recharge kit will not work; it doesnt fit on the high-pressure port. How soon you should get it serviced . Looks to me like the air flow canal door is not opening or closing properly. 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. Check the fuses. This can happen due to a leak or if the AC has not been recharged for a long time. You might want to think twice when making expensive repairs to the AC system in a Mercedes. So, even if you recharged your GLS AC at the recommended pressure, the system could still over pressurize when the ambient temperatures get warmer. This happens to protect the system. Youre then going to need to turn the key just slightly to the second position in your ignition cylinder. Check the blower fan. Diagnosing problems with an air conditioning system can be very complicated. Working on your Mercedes Benz's aircon system is time-consuming but not . Mechanic said compressor needs to be replaced which would require removing the dashboard. 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. I bought a low mileage 2002 s500 with full AMG last summer for my big "60". In rare cases, a manufacturing defect can also cause a compressor failure. If there is something going on with your damper, it could be putting, well. If only hot air comes out of the air vents in your GLS, then the problem probably lies somewhere else. 2000 Mercedes-Benz E320 167,000 mi, Check your vehicles owners manual or look under the hood to find the type of the refrigerant your vehicle uses. I know the post is 6 years old, but THANK YOU! Check the AC compressor. Excessive oil can also reduce the performance of the compressor and can cause it to fail prematurely. Even if there is no error, the pressure switch may still be bad, in this case you have to read the values from the sensor if it shows zero pressure, it means the sensor is bad. }, How to replace an AC condenser. A worn out or weakened blower motor can also produce abnormal sounds when in operation. Mercedes Benz ac blowing hot air - What you do now? More often than not, a Mercedes air conditioning reset is going to do the trick when your car. But its definitely worth a shot since your alternative is going to be either riding around in a hot car or paying for costly AC repairs. Gather the right tools. One of the key components of the A/C system is the compressor. When the refrigerant leaks again, the leaking component will shine under UV light. Look under the hood or under the dash to find the fuses. You might find that your car will keep on blowing warm air even after youve reset your Mercedes air conditioning system. Or, it may cause the compressor to run continuously and freeze up the evaporator coil resulting in poor cooling and reduced airflow. Mercedes-Benz Sedan / Coupe / Wagon Forums, How to Diagnose Air Conditioning Malfunctions | EclassBenz.com. If there is a problem with the temperature of the air conditioning system, it could be due to a bad blend door actuator. Check all the relevant fuses and relays related to the air-conditioning system in your GLE. 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. The pressure drops in the expansion valve, allowing the refrigerant to expand. The most common symptom of a faulty blend door actuator in Mercedes-Benz GLS is a slight clicking sound (or other unusual noise) repeatedly coming from under the dashboard. thank you unitfreebie for all that information this is my first summer with this car, the ac was not working for as long as i have had it so i dont know the conditions underwhich it stoped working. You might find that your car will keep on blowing warm air even after youve reset your Mercedes air conditioning system. The sound will be most prominent for a few seconds when you turn on the air conditioning or adjust the temperature. The site includes MB Forums, News, Galleries, Publications, Classifieds, Events and much more! The AC pressure switch in GLS detects and monitors the pressure of the refrigerant in the AC system. As you charge the system, you may notice the A/C starts to work. The air then blows through the evaporator, which makes it get cold. The OBDII connector is usually located under the dashboard. Sounds strange to blow cold on one side and not the other but recharging the system is the typical repair. "width": 710 A professional mechanic can swiftly diagnose the poor AC cooling issue for you. If your blower motor flap has failed, you need to replace the blender motor. Shake the canister briefly and release the refrigerant into the system until the recommended pressure has been achieved. Leaks are the most common problem associated with the air conditioning system. Too much oil: If there is excessive amount of oil added with the refrigerant, it can cause compressor performance issues which reduces cooling efficiency, and can also cause premature compressor failure. Attach the hose from the A/C Recharge Kit and check the pressure. Just have it refilled and you can drive with pleasant temperatures again. This can happen due to a leak or if the AC has not been recharged for a long time. By flowing through the condenser, the refrigerant loses heat, which converts into a warm liquid from hot gas. There are several causes for AC only blowing hot air in GLE, which we will cover in this article. Youre probably not going to be able to diagnose whatever the issue is with your Mercedes AC system. Once youve done this, you can let the buttons go. 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. Less common causes are clogged expansion valve or orifice tube . You should continue to hold these buttons down until their individual LED lights start flashing for you. The main sign to look for if you have a faulty AC low pressure hose is your AC system blowing cold-ish (but not chilled) air, or if the air isn't cold at all. Remember that these are a guideline, and your actual temperatures and pressures will vary depending on the humidity in the air and the condition of your system. 2005 Mercedes-Benz C230. JavaScript is disabled. Have you driven it yet? 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. Therefore, it is recommended to do this in a workshop. Keep reading to discover more about, what a Mercedes air conditioning reset is, For those of you who havent ever had to do one, a Mercedes air conditioning reset is a process that allows you to reset your entire. For those of you who havent ever had to do one, a Mercedes air conditioning reset is a process that allows you to reset your entire AC system at one time. Shake the canister briefly and release the refrigerant into the system until the recommended pressure has been achieved. The A/C system is designed to disengage the A/C if the pressure in the lines is too low. Unfortunately, this procedure does not allow you to get into the deeper layers of the filter. the air conditioning is blowing hot. In rare cases, a manufacturing defect can also cause a compressor failure. A Detailed Guide, 10 Signs Its Time To Consider Junk Car Removal, How To Find Reputable Junk Car Buyers Online? 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.