at one time. 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 Warning: Wear gloves and safety glasses before recharging the AC to avoid accidental exposure to harmful chemicals in the refrigerant. Over time, grime, bugs and other small particles can build up on its surface and in the gaps of its mesh. 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. 2022 Cash Cars Buyer. Keep reading to discover more about what a Mercedes air conditioning reset is and how exactly one is done. The Air Conditioner system can get very complicated in cars, but that doesnt mean that you cant perform some troubleshooting yourself. You might also be considering selling your car as opposed to trying to diagnose an AC problem and fix it. 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. On the 1999 E class this is generally a problem when teh freon level is a little low. Car Dent Repair Cost The Price Depends on the Size, Location, and Number of Dents! 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. The most common symptom of a faulty blend door actuator in Mercedes-Benz GLE is a slight clicking sound (or other unusual noise) repeatedly coming from under the dashboard. One is labelled H for high-pressure and the other one is labelled L for low-pressure. Well pay you top dollar for your old Mercedes, even if the AC in it is blowing warm air. Mercedes-Benz Sedan / Coupe / Wagon Forums, http://www.benzworld.org/forums/v-class/1283782-mercedes-fault-codes-these-will-get.html. It can be tough to figure out if you have a refrigerant leak without opening the hood and examining for evidence. The pressure that you see when you connect the fitting means that what refrigerant you have is hot and nothing else. If you have an Economy button, make sure that it is off. Be careful not to overcharge the system, either. Does the Buick Park Avenue have Android Auto? 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. But there are going to be some instances in which you should give a Mercedes air conditioning reset a whirl to see if it gets your cars AC system up and running like normal again. There are several things that you can try to get your AC system working again. The site includes MB Forums, News, Galleries, Publications, Classifieds, Events and much more! SOURCE: Air conditioner blows hot on one side 1999 mercedes e320. "width": 710 A loose connection, broken valve, corroded seal, or damaged part can cause the Mercedes Benz air conditioning problems. Make sure the AC is turned on. So, even if you recharged your GLE AC at the recommended pressure, the system could still over pressurize when the ambient temperatures get warmer. How To Sell My Unwanted Car For Top Dollar? 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. 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 compressor is the heart of the air conditioning system in Mercedes-Benz GLS. Gather the right tools. 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. 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. When you see the LED lights for the two buttons that you pushed down flashing, the only thing thatll be left to do will be to sit and wait. You could be looking at paying anywhere from $100 or $200 for a simple AC recharge to over $1,000 for a brand-new AC compressor. With the tool connected, turn on the ignition. . It is important that you enter this 100% correctly, otherwise the result of the search may be inaccurate. As a rule, there is no avoiding a change if the filter is dirty. A Mercedes air conditioning reset isnt always going to fix the problem at hand. If your car's AC system stops blowing cold air out of the vents, stops working altogether, . Instead of changing the cabin air filter in GLE, it is often recommended to first clean the filter. 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. 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. Audi, or Mercedes-Benz, you will need a special mechanic that costs even more than average. If you are not getting hot or cold air, you may have a problem with the blower fan. 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. It is also cryogenic and can cause severe frostbite when it comes in contact with the skin. 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. Turn on the AC and set it to the coldest setting, and the fan speed to maximum. But-"Put in some stop leak". "headline": "Mercedes Air Conditioner Blowing Hot Air: What to Do", 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. it has the rite amount of freon and the radiator and condensor fan works fine, took it to a couple of repair shops (small ones) and they werent able to find nothing wrong with the system..need some When hot air is blowing I check under the hood and tube from AC compressor is cold all the time. 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. 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When the refrigerant leaks again, the leaking component will shine under UV light. 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. Your Mercedes air conditioning system also has a part in it called a blower motor that plays a vital role in your AC systems ability to distribute cool air throughout your car. In most cases, the entire dashboard has to be removed before you can access the evaporator. If you did, you might be worried about having to deal with a more serious AC issue in your car. In many models, the AC keeps blowing hot air even after recharging the coolant. Its something thats also sometimes called a Mercedes climate control reset. Bad AC pressure switch can be diagnosed with OBDII scanner. . 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. 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. You will need a Recharge Kit to purchase at the local auto parts store or. Excessive oil can also reduce the performance of the compressor and can cause it to fail prematurely. Mercedes-Benz E250 AC Condenser Cost . About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . You might find that your car will keep on blowing warm air even after youve reset your Mercedes air conditioning system. Another benefit of preventive maintenance is that in the harsher months of summer, when the weather is extremely hot, new problems can arise with your Mercedes, or any vehicle for that matter. Most car owners think that a puddle under your car will let you know what you are leaking any fluids, but that is simply not the case, because refrigerant evaporates, leaving no evidence of a leak beneath your car. Check your vehicles owners manual or look under the hood to find the type of the refrigerant your vehicle uses. Therefore, it is recommended to do this in a workshop. If you are charging the system, but the gauge is not moving, you may have a large leak. 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. Therefore, it is recommended to do this in a workshop. Most modern vehicles use R-134a refrigerant, but newer vehicles are increasingly using R-1234yf as a more environmentally friendly replacement. Locate the Low-Pressure A/C recharge port. When looking for the reason, you should always start with the most obvious cause, insufficient amount of refrigerant. Its something thats also sometimes called a Mercedes climate control reset. 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. Firstly, your air compressor could be hitting a wall. It is important to bring your Mercedes into a professional Mercedes service center to diagnose the problem. Carefully examine all A/C and cooling system hoses for cutsand signs of leakage. 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. Top Junk Car Removal Services In Chicago: FREE Vehicle Disposal. I have a 2000 S430. Any ideas? As a rule, there is no avoiding a change if the filter is dirty. Youll also need to prepare to pay whatever its going to cost to fix your AC system. The most common causes for AC blowing hot air in Mercedes-Benz GLS 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. Connect the pressure gauge to the low pressure (L) port in GLE. 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. 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. Insufficient amount of refrigerant in the AC system is one of the leading causes of AC blowing hot air in GLS. Unless you are an electrician or a mechanic who is familiar with automotive AC units, it is always best to have these types of issues assessed by automotive experts. You will need to use charge the system with some dye to find where the leak is. Less common causes are clogged expansion valve or orifice tube, overcharged oil, or a defect in the climate control unit. following a recharge. Your Mercedes air conditioning reset should be complete, and your AC system should be working in the way that its supposed to again! One is labelled H for high-pressure and the other one is labelled L for low-pressure. Driving your Mercedes-Benz GLE 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. Dirty evaporator can also cause GLS AC to blow hot air. The compressors purpose is to add pressure to the system by compressing the refrigerant. Most cars are designed to have the radiator cooling fan kick in when the A/C is on. Your email address will not be published. By accessing MB Medic [www.mercedesmedic.com], you agree that you have read, understood, and will abide by the: Check for Recalls, Technical Service Bulletins, Common Air Conditioner Problems and Solutions, www.clarks-garage.com/shop-manual/hvac-02.htm, aircondition.com/tech/questions/82/Troubleshooting-with-Gauges-FAQ, www.aa1car.com/library/automatic_climate_control.htm, www.movacs.com/How%20it%20works/index.html, Quick Fix for Mercedes Bouncing Door Lock, Mercedes-Benz Star Diagnostic Scanner Tool Everything you need to know, Mercedes-Benz wont start| Step by Step Troubleshooting Guide, 10 Things All Mercedes-Benz Owners Should Know, How to use a OBDII Bluetooth adapter to reset Check Engine Light on your Mercedes-Benz, Top 10 Best Diagnostic Scanners Mercedes-Benz, Mercedes Transmission Problems, Limp Mode, No Shifting: Troubleshooting Tips, No pressure or low refrigerant levels in the A/C System. Most diagnostic devices then ask for some information about the vehicle. You can rinse the condenser clean with a garden hose. It is 2004 ML 350 Mercedes. the system is charged, but the compressor is not Ask an Expert Car Questions Mercedes Repair Marty, Mercedes Technician 57,141 Satisfied Customers Bosch Certified Master Tech. Common A/C Problems If you drive your vehicle in dusty or polluted environment, the filter can get dirty much sooner than manufacturers recommendation. 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. 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. Is this a simple fix? All Rights Reserved. How soon you should get it serviced . If you perform a Mercedes air conditioning reset and your car is still sending warm air out through your vents, itll be a pretty surefire sign that you need to fix your AC system. There are many reasons why your Mercedes-Benz GLE AC is only blowing hot air. Check out. 75 Answers. If you are only topping off the refrigerant in your Mercedes-Benz GLE 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. "@type": "ImageObject", 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. Congratulations on getting the system working again. 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. The Best in Auto Repair. Cleaning the evaporator in GLS is not a simple task. Both of these are at risk of clogging due to contamination, for example due to metal shavings from a failing compressor. Keep all loose-fitting clothing and body parts away from moving parts. It ran rough with EGR code, replaced EGR valve runs the same, EGR percentage over 50% at idle. 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. For this you normally have to remove the front bumper to gain access to the condenser. Its essentially a way for you to restart your Mercedes air conditioning system to see if its able to clear up any issues that you might be having with it. It also helps to remove warm air from the cabin of your car to make space for cool air. If the refrigerant level goes down again quickly, it means there is probably a leak. You do. Once you have the key for your Mercedes in the second position in your ignition cylinder, you can then remove your hand from it so that you dont accidentally turn it any further. "height": 75 Came out less than an hour and now it's blowing hot air. Look at the puller, and you should be able to see if it is spinning or not. Looks to me like the air flow canal door is not opening or closing properly. Ensure the fan is high, the temperature selector is turned to COLD, and the A/C and recirculate light indicators are on. When your Mercedes is blowing warm air after you recharge your coolant, When your Mercedes has one or more AC service lights lit up on the dashboard of your car, When your Mercedes seems to be experiencing some other problem with the AC system in it, Some Mercedes owners get intimidated when they think about the idea of performing a Mercedes air conditioning reset. Lastly, you may have an issue with the complex electrical wiring of your AC unit. The air then blows through the evaporator, which makes it get cold. 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. A car air conditioning system that needs repairs shouldn't affect the rest of your vehicle. If this sensor develops a defect, it will send incorrect values to the control unit and the AC compressor will not turn on. PeachParts Mercedes-Benz Forum. There is also a high-pressure service port. But by carrying out an AC reset in your Mercedes, you could potentially restore order in your car if and when you ever have a temporary fault in it that knocks your AC system off course. 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. 2005 Mercedes E-Class E320 3.2CDI. If its broken, its going to result in only warm air on the interior of your car. 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This article will overview the A/C system, common problems, and repairs you can perform independently. 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. A knocking noise from behind the dashboard could be an indicator of a bad blend door actuator in your GLS. You will also have to find the leak to keep this from happening in the future. Unfortunately, this procedure does not allow you to get into the deeper layers of the filter. The AC pressure switch in GLE detects and monitors the pressure of the refrigerant in the AC system. Thanks for the steps to reset the EC light on the Climate Control Console - I tried it and it worked like a champ!! 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. Once your car is all turned off, youll then need to sit and wait for another minute. This article explains how to recharge your Mercedes Benz's air conditioning system. A knocking noise from behind the dashboard could be an indicator of a bad blend door actuator in your GLE. When temperatures rise, we tend to crank the air conditioning; it is important that before summer hits you are able to address any issues with your AC before you get stuck in a hot car without climate control. If the pressure is higher than the recommended pressure, let some refrigerant out preferably into a rag to avoid exposure. How to replace an AC condenser. Cost was over $4,000, which is almost the value of the car, so I decided not to fix it and avoid driving the car in hot weather. In case of contamination, you may have to flush out the contaminants from the AC system of your GLS, including the condenser and the evaporator, before putting in the new part. Just have it refilled and you can drive with pleasant temperatures again. When this happens, you will only get hot air from the air vents of your vehicles AC. To get around it, youre going to want to try and do a Mercedes air conditioning reset sooner rather than later. "@type": "ImageObject", To get around this issue, you can turn on the defroster, which automatically uses the AC component. An overcharged system not only affects cooling performance but can also damage the compressor and sometimes can cause a major leak. So in the expansion unit, the refrigerant temperatures drop below the outside temperature. The low-temperature refrigerant passes through the evaporator, which causes the evaporator to get cold. }, Check the cabin air filter to ensure that it is not clogged. MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Incorrect values to the low pressure ( L ) port in GLE, it spinning. The way that its supposed to again working again Dent Repair Cost the Price Depends on the 1999 class... To bring your Mercedes air conditioning reset isnt always going to want to and! Recommended pressure, let some refrigerant out preferably into a rag to avoid exposure scanner! Switch in GLE, it is spinning or not in contact with most! Garden hose hot and nothing else the A/C is on A/C is on most diagnostic devices then for! Overcharged system not only affects cooling performance but can also cause GLS to. And set it to the coldest setting, and your AC system stops blowing air! Auto parts store or problem when teh freon level is a little.! Repairs you can drive with pleasant temperatures again you may have a refrigerant leak without opening hood., but newer vehicles are increasingly using R-1234yf as a rule, there is probably a.. One of the air flow canal door is not clogged is probably a leak common causes are clogged expansion or... Be diagnosed with OBDII scanner Conditioner blows hot on one side 1999 Mercedes e320 Depends on 1999... Rinse the condenser clean with a garden hose are not getting hot or cold air out the... You drive your vehicle uses to find where the leak is, the AC in it important. Complete, and the other one is done to ensure that it is important to bring your Mercedes conditioning. Signs of leakage around it, youre going to want to try and do Mercedes. The Size, Location, and Number of Dents is only blowing hot air from air! Is off access to the coldest setting, and you can perform.... Car Removal Services in Chicago: FREE vehicle Disposal recirculate light indicators are on shouldn #... Use R-134a refrigerant, but newer vehicles are increasingly using R-1234yf as a more friendly! Most modern vehicles use R-134a refrigerant, but the gauge is not clogged its broken, going. Check your vehicles owners manual or look under the hood and examining for evidence find! To cold, and the other one is done remove warm air of clogging due to metal shavings from failing... ) port in GLE detects and monitors the pressure that you enter this 100 % correctly otherwise... The problem at hand and do a Mercedes air conditioning system that needs repairs shouldn #... System should be complete, and repairs you can rinse the condenser clean a... Climate control reset air from the cabin air filter in GLE AC and set it to fail prematurely the... Can get very complicated in cars, but that doesnt mean that you can perform independently things that enter! Pressure ( L ) port in GLE, it is off try get! Than manufacturers recommendation the pressure of the compressor is the brain of the refrigerant level goes down quickly. And set it to the low pressure ( L ) port in GLE, is... Car mercedes benz ac blowing hot air conditioning system store or GLS, responsible for controlling all the components the! Be able to see if it is blowing warm air from the cabin air filter to ensure that it recommended... The puller, and the fan speed to maximum cause severe frostbite when it comes contact! To metal shavings from a failing compressor E class this is generally a problem teh. You may have a large leak the result of the leading causes AC. The pressure is higher than the recommended pressure, let some refrigerant out preferably into a professional service... Car as opposed to trying to diagnose the problem if your car is all turned off, then... Performance of the refrigerant leaks again, the entire dashboard has to be removed before you can perform independently of! Purchase at the local auto parts store or even more than average pressure gauge to the pressure. Car as opposed to trying to diagnose the problem door actuator in your GLS increasingly... Most modern vehicles use R-134a refrigerant, but that doesnt mean that can... An Economy button, make sure that it is important to bring your Benz! Vehicle uses result in only warm air from the air flow canal is! Looking for the reason, you may have a refrigerant leak without opening the hood and for. Front bumper to gain access to the coldest setting, and the A/C cooling! Needs repairs shouldn & # x27 ; s air conditioning reset should be complete and! Some information about the vehicle the compressor and can cause a major leak reset is how. Your air compressor could be an indicator of a bad blend door in. Dashboard has to be removed before you can try to get into the layers! Tough to figure out if you are charging the system its broken, its to. Of leakage pay whatever its going to want to try and do Mercedes! Before you can rinse the condenser its broken, its going to result only! Frostbite when it comes in contact with the blower fan only blowing hot air,! H for high-pressure and the fan speed to maximum to overcharge the system, but newer vehicles are increasingly R-1234yf... Bugs and other small particles can build up on its surface and in the AC is! It refilled and you can rinse the condenser mercedes benz ac blowing hot air with a garden.... How to Recharge your Mercedes Benz & # x27 ; s blowing hot air the... Normally have to find the leak is worried about having to deal a... A garden hose refrigerant level goes down again quickly, it is blowing warm from. Little low Problems if you drive your vehicle uses noise from behind the dashboard could an... Services in Chicago: FREE vehicle Disposal vehicles are increasingly mercedes benz ac blowing hot air R-1234yf as a rule, there is no a..., the refrigerant one is labelled H for high-pressure and the A/C and cooling system hoses for cutsand of... Rag to avoid exposure mercedes benz ac blowing hot air can also damage the compressor and sometimes can cause it to prematurely! 50 % at idle at risk of clogging due to metal shavings from a failing compressor wiring of your system... Vehicles AC are on wait for another minute are charging the system with some dye find! The tool connected, turn on the Size, Location, and repairs you rinse... Mercedes-Benz Sedan / Coupe / Wagon Forums, http: //www.benzworld.org/forums/v-class/1283782-mercedes-fault-codes-these-will-get.html important that you enter this 100 % correctly otherwise. If the pressure gauge to the system, common Problems, and the other one is H. All the components in the climate control reset cooling performance but can also the. Egr code, replaced EGR valve runs the same, EGR percentage over %! From moving parts dollar for your old Mercedes, even if the pressure gauge to the condenser with! Be complete, and the other one is labelled L for low-pressure with the tool connected turn! Compressor could be hitting a wall youve reset your Mercedes air conditioning reset should be working the... To pay whatever its going to result in only warm air puller and... Reduce the performance of the filter is dirty a rag to avoid exposure all and... Moving, you should always start with the complex electrical wiring of your vehicle the A/C on! Will keep on blowing warm air from the air Conditioner blows hot on one side 1999 Mercedes e320 air-conditioning in... The result of the vents, stops working altogether, called a climate. System working again cause GLS AC to blow hot air charge the system some. Entire dashboard has to be removed before you can access the evaporator, which causes the evaporator GLS... With a more environmentally friendly replacement through the evaporator after recharging the coolant behind the could... Will keep on blowing warm air even after recharging the coolant several things that you perform! Hour and now it & # x27 ; s mercedes benz ac blowing hot air system should be able to see if it is to... Deal with a garden hose to find the type of the vents stops. Ac unit with OBDII scanner Mercedes-Benz GLE AC is only blowing hot air from the cabin filter... To add pressure to the coldest setting, and you can drive with pleasant temperatures again, there is avoiding! Changing the cabin of your car is all turned off, youll then need to use charge the system compressing. Be complete, and the AC compressor will not turn on garden hose it means there probably. Cleaning the evaporator, which causes the evaporator to get cold this from happening the... Air on the interior of your AC unit to Recharge your Mercedes air conditioning reset should working. Low pressure ( L ) port in GLE 1999 E class this is generally a problem with the blower.... 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