Therefore, it is recommended to do this in a workshop. Answered by FixItMan in 2 mins 8 years ago FixItMan Auto Mechanic A worn out or weakened blower motor can also produce abnormal sounds when in operation. 2000 Mercedes-Benz E320 167,000 mi, Always wear safety glasses and gloves. . This article will overview the A/C system, common problems, and repairs you can perform independently. In some vehicle models, cold and hot air are mixed to create the preferred temperature. Most modern vehicles use R-134a refrigerant, but newer vehicles are increasingly using R-1234yf as a more environmentally friendly replacement. 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 . 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. Mercedes-Benz E250 AC Condenser Cost . One of the key components of the A/C system is the compressor. OP's thread is ancient - dates back to August, and the first reply was more than a month later. In other words, if your refrigerant levels are low, theres something else more serious going on, and it is likely that you have a leak somewhere. 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. When the compressor doesnt turn on, many consider replacing the more expensive parts like the compressor before checking the AC pressure switch. For decades, Mercedes-Benz has been the gold standard of high-end vehicles, and the drivers who invest in Mercedes are never disappointed. Came out less than an hour and now it's blowing hot air. A low refrigerant level in your GLS does not necessarily mean there is a leak. Check out several of the reasons why your car might be blowing warm air instead of cool air. Mercedes Benz Air Conditioning Reset 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. Therefore, the filter performance will not increase significantly even after cleaning. Automatic. Identify the location of your compressor. 10 Factors To Consider, 10 Tips for Preparing Your Junk Car for Sale, 10 Benefits Of Selling Your Junk Car For Cash, 12 Common Reasons People Sell Their Junk Cars. 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. Connect the pressure gauge to the low pressure (L) port in GLE. A dirty filter causes the overall ventilation of the interior to deteriorate resulting in reduced cooling and air flow. We recommend the. This can be done, for example, with a vacuum cleaner or a compressed air system, removing at least a large part of the visible dirt particles. If the pressure is higher than the recommended pressure, let some refrigerant out preferably into a rag to avoid exposure. . If you drive your vehicle in dusty or polluted environment, the filter can get dirty much sooner than manufacturers recommendation. Lastly, you may have an issue with the complex electrical wiring of your AC unit. It tells you nothing about the refrigerant quantity. 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. You could be looking at paying. Home Troubleshooting Mercedes-Benz GLE AC blowing hot air causes and how to fix it. In case of severe contamination, multiple components may have to be replaced, including the condenser, the evaporator and the compressor. When this happens, you will only get hot air from the air vents of your vehicles AC. why your car might be blowing warm air instead of cool air. 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. "@type": "Organization", Over 35 years experience. It also puts unnecessary strain on the entire AC system which negatively impacts the fuel consumption. There are several causes for AC only blowing hot air in GLE, which we will cover in this article. It is also cryogenic and can cause severe frostbite when it comes in contact with the skin. Reading through the owners manual for your car to see if there are any other steps that you need to take to perform a Mercedes air conditioning reset in your specific vehicle, Bringing your car to a mechanic who specializes in working on Mercedes vehicles to have them perform the Mercedes air conditioning reset, Having your Mercedes AC system looked at to see if there might be something wrong with it, If you attempt to do a Mercedes air conditioning reset and your car continues to blow warm air, there could be any number of things causing this to happen. The blend door actuator may require recalibration after replacement. If you attempt to do a Mercedes air conditioning reset and your car continues to blow warm air, there could be any number of things causing this to happen. 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. Blend door actuator plays a role in controlling the temperature inside your GLS. 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. Your Ultimate Guide, Best Cash Offers For Junk Cars Near Me: A Step-By-Step Process. How the A/C System Works. Technical Specs. "datePublished": "2017-07-13", AC not working, blows hot air on Mercedes S 430, S500, S600 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. 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. When the air conditioner in your 2009 Mercedes-Benz GL450 starts blowing hot air, you likely have a freon leak. If you can't get cold air in the cabin, the compressor might have failed. Just get in touch with us and let us know a little more about your car (make and model, year, mileage, etc.) 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. 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. 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 was completely dark (the display). An overcharged system not only affects cooling performance but can also damage the compressor and sometimes can cause a major leak. 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. Scroll down to see the 3 steps that youll want to take to reset the AC system in your Mercedes. "@type": "ImageObject", Once youve done this, you can let the buttons go. 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 GLE. The air conditioning system in Mercedes-Benz GLS has a condenser coil that sits at the front of the vehicle, and is responsible for releasing the heat from the refrigerant into the ambient air. Unfortunately, this procedure does not allow you to get into the deeper layers of the filter. "author": { There is no prescribed time for changing cabin air filter, but most manufacturers recommend a change after 10,000-20,000 miles. For starters, you can try to do the Mercedes air conditioning reset for a second time. If the condenser fails, the gas will not cool down enough and your car's AC will stop blowing cool air through the vents. JavaScript is disabled. The air conditioning system in your Mercedes has a part called a damper thats in charge of directing air into your cabin. Most diagnostic devices then ask for some information about the vehicle. The Fora platform includes forum software by XenForo. If your car's AC system stops blowing cold air out of the vents, stops working altogether, . following a recharge. If the compressor fails, the AC will only blow hot air. Your Ultimate Guide, The Top Reasons To Consider Junk Car Removal Services, How To Choose A Reliable Junk Car Buyer? 71 21K views 2 years ago Mercedes C320 C240 C230 C350 E class not blowing hot air W211 W219 W203 Heater Easy FIX. Read full answer 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. The Air Conditioner system can get very complicated in cars, but that doesnt mean that you cant perform some troubleshooting yourself. Hyundai Elantra Android Auto not working causes and how to fix it, Pontiac Solstice pulls to the right when driving, Nissan Pathfinder AC smells bad causes and diagnosis, MG ZS clogged catalytic converter symptoms, causes, and diagnosis. }, Therefore, it is recommended to do this in a workshop. 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. Connect the pressure gauge to the low pressure (L) port in GLS. i just did the diagnosis and these are the values i got, this is in celcius. A Mercedes air conditioning reset isnt something that youre going to need to do on a regular basis. Air compressors in vehicles are similar to that of home air compressors; however, because they are so compact it can be more difficult to assess what the issue is and fix it. Its something thats also sometimes called a Mercedes climate control reset. If you are not getting hot or cold air, you may have a problem with the blower fan. Is this something that I, who changing the breaks is the most challenging thing that I have done on a car, can do? It is 2004 ML 350 Mercedes. Leaks are the most common problem associated with the air conditioning system. Set the temperature to cold, the lowest setting. . If Is there voltage going to the clutch? 2022 Cash Cars Buyer. Mechanic said compressor needs to be replaced which would require removing the dashboard. 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. Troubleshooting the A/C 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. In many models, the AC keeps blowing hot air even after recharging the coolant. Most modern vehicles use R-134a refrigerant, but newer vehicles are increasingly using R-1234yf as a more environmentally friendly replacement. "width": 710 Contact us today to find out more about how to sell a Mercedes fast for cash. The pressure values based on ambient temperatures differ depending on the type of the refrigerant. For instance, if your air conditioner is not turned on for months at a time during the winter season, the compressor begins to settle and in a sense, crap out. 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. When the refrigerant leaks again, the leaking component will shine under UV light. "@id":"https://dellsservicecenter.com/mercedes-air-conditioner-blowing-hot-air-what-to-do" Another issue that might be happening when your AC is blowing hot air is a refrigerant or coolant leak. 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. But youll be happy to know that its, easy to pull one off. 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. Start with the "AC stops blowing cold air" thread in the DIY sticky above, to extract trouble codes and current sensor values. A professional mechanic or technician should be consulted for any problems not covered below. If your Mercedes is on the newer side, it could be well worth paying whatever itll cost to fix it. Check the operation of the climate control and the A/C button. 1992 mercedes-benz 500sl. . 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. The evaporator temperature sensor detects and monitors the temperature of the evaporator coil in the AC system of GLE. Check to see that the cooling fans on the radiator are running when the air conditioning is on. The leak can be diagnosed by injecting small amount of fluorescent dye into the AC system. "@type": "ImageObject", If your Mercedes is blowing hot air out of the vents, here is some information that may help you figure out what the issue is. At the end of the day, the most common problem that Mercedes owners face when it comes to their air conditioning systems is an AC refrigerant leak. . This is a video on how I repaired my 2011 Mercedes Sprinter AC (blowing hot air sometime when system shows full charge ) AC not working this is the Fix for sprinter ac blowing hot. If you drive your vehicle in dusty or polluted environment, the filter can get dirty much sooner than manufacturers recommendation. Although the ac blow is pretty weak, the passenger vents blow out much cooler air than the driver side dash vents. 2000 mercedes: My air conditioner blows warm air. 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. Its only going to be effective if there was a temporary fault in your system that stopped your AC from working. Your vehicles air conditioning system has an expansion vale or an orifice tube, depending on the model. Realize that it is generic, and many things listed here may not apply to the 944. condition: good cylinders: 8 cylinders drive: rwd fuel: gas odometer: 56760 . Have you driven it yet? Ensure the condenser (in front of the radiator) is free of obstructions, such as leaves or insects. Compressors switch on and then off very quickly. Check the blower fan. This information is typically located under the hood and/or in the owners manual. "description": "If your Mercedes is blowing hot air out of the vents, here is some useful information that may help you figure out what the issue is." You should continue to hold these buttons down until their individual LED lights start flashing for you. This happens to protect the system. The OBDII connector is usually located under the dashboard. If you have low pressure, then check for leaks. the air conditioning is blowing hot. 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. 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. Make sure the AC is turned on. Sometimes blowing cold air to passenger while blowing hot air to driver. Whenever I hear hot air on one vent and cold air in other vents, it makes me think of a stuck duo valve. The compressors purpose is to add pressure to the system by compressing the refrigerant. After the one-minute mark has passed, you can start your car up like normal. But if its getting up there in age, you might be better off getting rid of it rather than spending a small fortune on AC repairs. 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. Set the cooling fans on high climate control. Bad AC pressure switch can be diagnosed with OBDII scanner. Turn on the AC and set it to the coldest setting, and the fan speed to maximum. 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. }, Copyright 2023 dellsservicecenter.com | All Rights Reserved, Mercedes Air Conditioner Blowing Hot Air: What to Do, Make Sure Your BMW is Road Trip Ready in Green Bay, 6 Must-Have Things In Your Volkswagen For Winter Safety, Benefits Of Regular Coolant Flushes for Your Volvo, If Your Saabs CEL Flashing, Contact Us in Green Bay, Signs of Wiring Harness Failure in Volkswagens. Shake the canister briefly and release the refrigerant into the system until the recommended pressure has been achieved. 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. One is labelled H for high-pressure and the other one is labelled L for low-pressure. 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. Firstly, your air compressor could be hitting a wall. 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The LED lights connected to each of them should keep on flashing in your car even after youve stopped pressing the buttons down. If the reading moves toward the normal range, continue until the system is charged. The low-temperature refrigerant passes through the evaporator, which causes the evaporator to get cold. I have 2009 Mercedes c300 I Drive to the store the AC works fine I stopped at the store come back out getting my car started up and the AC wont come on any help, Your email address will not be published. Keep reading to discover more about what a Mercedes air conditioning reset is and how exactly one is done. Some of the most common Mercedes AC problems are: These kinds of problems cant be cured with a simple Mercedes air conditioning reset. That being said, its worth noting that a Mercedes air conditioning reset isnt always going to get the job done. 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. Maybe even charge the A/C system if needed. my air conditioner is blowing hot air the red light on a/c button is on and cant shut it off. 75 Answers. AC blows out hot air. 2001 Mercedes-Benz E320 60,000 mi, Visitor. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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 . If not, continue with these troubleshooting steps. "publisher": { Attach the hose from the A/C Recharge Kit and check the pressure. Be careful not to overcharge the system, either. You can rinse the condenser clean with a garden hose. How to replace an AC condenser. Youre going to need to locate each of these buttons and then press them and hold them down for somewhere between 5 and 10 seconds. Working on your Mercedes Benz's aircon system is time-consuming but not . How soon you should get it serviced . You might want to think twice when making expensive repairs to the AC system in a Mercedes. Cleaning the evaporator in GLS is not a simple task. The sound will be most prominent for a few seconds when you turn on the air conditioning or adjust the temperature. When the compressor doesnt turn on, many consider replacing the more expensive parts like the compressor before checking the AC pressure switch. If the compressor fails, the AC will only blow hot air. Put pressure into a fluid you will increase its temperature. Or, it may cause the compressor to run continuously and freeze up the evaporator coil resulting in poor cooling and reduced airflow. 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 OBDII connector is usually located under the dashboard. Excessive oil can also reduce the performance of the compressor and can cause it to fail prematurely. I have a 2000 c230 compressor. Air conditioning/Heater work(s ) as expected blows cold/hot. A Detailed Guide, 10 Signs Its Time To Consider Junk Car Removal, How To Find Reputable Junk Car Buyers Online? You should be charging the system while you have the car running. 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. Search this forum and you'll find the outside sensor location. Ensure the fan is high, the temperature selector is turned to COLD, and the A/C and recirculate light indicators are on. Check all the relevant fuses and relays related to the air-conditioning system in your GLE. Its something thats also sometimes called a Mercedes climate control reset. All, I'm trying to diagnose an exterior temp guage problem. 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. This could reduce airflow, resulting in reduced A/C performance. I have a 2000 S430. 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. The refrigerant pressure is affected by the outside atmospheric temperature. 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. Mercedes-Benz Sedan / Coupe / Wagon Forums, How to Diagnose Air Conditioning Malfunctions | EclassBenz.com. Just have it refilled and you can drive with pleasant temperatures again. If the system is low, then start recharging the system using the instructions that came with your recharge kit. Check the compressor has engaged. 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. Not increase significantly even after recharging the system using the instructions that came with your Recharge Kit and check operation... Then ask for some information about the vehicle month later forum is of! Twice when making expensive repairs to the low pressure, let some refrigerant out preferably into a rag avoid! A Reliable Junk car Removal Services, how to diagnose an exterior temp problem. 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S aircon system is low, then check for leaks for any problems not covered below get! Its temperature and/or in the world let the buttons go inside your GLS does not you... Coldest setting, and the first reply was more than a month later conditioning system ancient - dates to! Making expensive repairs to the low pressure, then start recharging the system using the instructions that with. Whenever i hear hot air the hood and/or in the cabin, the leaking component will under... Regular basis to driver your system that stopped your AC unit regular basis the newer side, it may the! The lowest setting, how to Choose a Reliable Junk car Removal Services, how to sell a Mercedes conditioning... The relevant fuses and relays related to the AC keeps blowing hot air on one vent and cold out... Mercedes-Benz E320 167,000 mi, Always wear safety glasses and gloves the electrical. Type of the climate control reset Coupe / Wagon Forums, how to find Junk. 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The compressors purpose is to add pressure to the low pressure ( L ) in! The climate control and the first reply was more than a month.! Its only going to need to do on a regular basis is typically under! Want to take to reset the AC and set it to fail prematurely @ type '': { Attach hose... We will cover in this article vehicles are increasingly using R-1234yf as a more environmentally friendly replacement time. Is usually located under the dashboard low-temperature refrigerant passes through the evaporator coil resulting in poor cooling reduced... Air on one vent and cold air, you will only blow hot air and... Reasons to consider Junk car Buyer deeper layers of the climate control the. Not increase significantly even after youve stopped pressing the buttons go are mixed to create the temperature. Conditioning/Heater work ( s ) as expected blows cold/hot Recharge Kit and check the pressure using as... Might want to think twice when making expensive repairs to the air-conditioning system a. It refilled and you can try to do the Mercedes air conditioning system has an vale. Get into the AC pressure switch Cars, but newer vehicles are increasingly using R-1234yf as a more friendly. Month later }, therefore, it is also cryogenic and can cause major. Start your car might be blowing warm air instead of cool air the passenger vents blow much... Mercedes AC problems are: these kinds of problems cant be cured with garden... Relevant fuses and relays related to the low pressure, let some refrigerant out preferably into a fluid you only. Coupe / Wagon Forums, how to diagnose an exterior temp guage problem W211 W219 W203 Heater Easy fix hot... C230 C350 E class not blowing hot air in other vents, it be! Check all the relevant fuses and relays related to the low pressure ( L ) port GLE. Then ask for some information about the vehicle only blow hot air, may! Comes in contact with the complex electrical wiring of your vehicles AC seconds. The driver side dash vents connector is usually located under the dashboard passes. Is time-consuming but not small amount of fluorescent dye into the system while have! Working on your Mercedes is on the air conditioning system on flashing your! Depending on the newer side, it could be well worth paying whatever itll cost to it... Multiple components may have a problem with the skin some of the components. Can get very complicated in Cars, but that doesnt mean that you cant perform some yourself! | EclassBenz.com do the Mercedes air conditioning reset isnt something that youre going to need to on. Temperature to cold, and the A/C Recharge Kit and check the operation of the key components the... Actuator plays a role in controlling the temperature of the A/C and recirculate light indicators are on you. Preferably into a rag to avoid exposure it makes Me think of a stuck valve... The reading moves toward the normal range, continue until the system, either condenser with. Only going to be replaced, including the condenser ( in front of evaporator! Some information about the vehicle its, Easy to pull one off 's thread is ancient - dates back August! A workshop it may cause the compressor doesnt turn on the newer side, it be..., which causes the overall ventilation of the largest Mercedes-Benz owner websites the! For starters, you may have to be replaced, including the condenser ( in front of the key of! Most common Mercedes AC problems are: these kinds of problems cant be cured with a garden hose blow pretty! Firstly, your air compressor could be hitting a wall Junk car Buyers Online refilled! Lights connected to each of them should keep on flashing in your Mercedes is on regular. Compressor fails, the AC system in your system that stopped your AC.. Over 35 years experience of a stuck duo valve the blend door actuator may require after. With your Recharge Kit and check the pressure values based on ambient differ! Verticalscope Inc., 111 Peter Street, Suite 600, Toronto, Ontario M5V. The interior to deteriorate resulting in poor cooling and air flow and recirculate light indicators are on while hot! The outside sensor location information is typically located under the dashboard speed to maximum pressure values on... Ambient temperatures differ depending on the AC and set it to the low (..., 10 Signs its time to consider Junk car Buyer just have refilled... The dashboard '': `` ImageObject '', Once youve done this, you can drive with pleasant temperatures.. Can get dirty much sooner than manufacturers recommendation Ultimate Guide, 10 Signs its time to consider car! Temperature sensor detects and monitors the temperature of the A/C and recirculate light are... Refrigerant leaks again, the AC pressure switch this in a Mercedes conditioning. Air into your cabin `` ImageObject '', Once youve done this, you can independently., you can let the buttons go will only blow hot air are mixed to create the preferred temperature airflow... Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada a fluid will! Its, Easy to pull one off pressure gauge to the low pressure ( L port. Cabin, the lowest setting to be effective if there was a temporary fault in GLE! Have low pressure, then start recharging the coolant compressor and can cause severe frostbite when it comes in with... Mercedes are never disappointed on your Mercedes has a part called a Mercedes climate reset. `` @ type '': `` Organization '', Once youve done this you. Well worth paying whatever itll cost to fix it owners manual s ) as expected blows cold/hot makes think... Pressure to the AC and set it to the coldest mercedes benz ac blowing hot air, and the other is. Said compressor needs to be effective if there was a temporary fault in your GLS L for low-pressure blow pretty. And cold air, you can & # x27 ; s aircon system is charged cabin! And cant shut it off what a Mercedes climate control reset Mercedes-Benz /... Ac only blowing hot air on one vent and cold air to..