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. Make sure the AC is turned on. 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. 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. For a better experience, please enable JavaScript in your browser before proceeding. You might find that your car will keep on blowing warm air even after youve reset your Mercedes air conditioning system. If the compressor fails, the AC will only blow hot air. If your blower motor flap has failed, you need to replace the blender motor. }, A car air conditioning system that needs repairs shouldn't affect the rest of your vehicle. Read full answer Compressors switch on and then off very quickly. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. "url": "https://dellsservicecenter.com/wp-content/uploads/2015/12/logo.png", About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . How to replace an AC condenser. Both of these are at risk of clogging due to contamination, for example due to metal shavings from a failing compressor. The evaporator temperature sensor detects and monitors the temperature of the evaporator coil in the AC system of GLE. When this happens, you will only get hot air from the air vents of your vehicles AC. "name": "Dells Service Center", This information is typically located under the hood and/or in the owners manual. 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. The refrigerant pressure is affected by the outside atmospheric temperature. 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. If you have AC refrigerant leaking from your car, you can perform a Mercedes air conditioning reset as many times as you want. 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? There is also a high-pressure service port. The air conditioning system in Mercedes-Benz GLE 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. 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. Close. 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. 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. The pressure values based on ambient temperatures differ depending on the type of the refrigerant. If its broken, its going to result in only warm air on the interior of your car. Did you just attempt a Mercedes air conditioning reset and find that it didnt do the trick for you? This section will cover some common problems associated with the A/C system. 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. I bought a low mileage 2002 s500 with full AMG last summer for my big "60". This could be dangerous and cause problems to your A/C system. Your Mercedes air conditioning reset should be complete, and your AC system should be working in the way that its supposed to again! The pulley spins any time the engine is running. But-"Put in some stop leak". In fact, you might spend years driving around in a Mercedes and never have to perform an air conditioning reset. Carefully examine all A/C and cooling system hoses for cutsand signs of leakage. The leak can be diagnosed by injecting small amount of fluorescent dye into the AC system. Its something thats also sometimes called a Mercedes climate control reset. All, I'm trying to diagnose an exterior temp guage problem. "author": { 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. A dirty filter causes the overall ventilation of the interior to deteriorate resulting in reduced cooling and air flow. A low refrigerant level in your GLE does not necessarily mean there is a leak. Look at the puller, and you should be able to see if it is spinning or not. 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. It is a frustrating problem, especially during the summer, when it is almost impossible to drive a car without the AC on. Gather the right tools. I got this from one of the threads here. If this sensor develops a defect, it will send incorrect values to the control unit and the AC compressor will not turn on. The most common causes for AC blowing hot air in Mercedes-Benz GLE 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. Always wear safety glasses and gloves. Mercedes-Benz E250 AC Condenser Cost . Leakage from A/C system hoses is often indicated by an accumulation of dirt and oil, particularly at connections and fittings. Insufficient amount of refrigerant in the AC system is one of the leading causes of AC blowing hot air in GLE. But since its the most easiest thing to check, you should definitely start by inspecting the condition of the filter when troubleshooting the AC. To begin troubleshooting, you must first connect the diagnostic tool to your GLE. If the pressure is higher than the recommended pressure, let some refrigerant out preferably into a rag to avoid exposure. 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. Insufficient amount of refrigerant in the AC system is one of the leading causes of AC blowing hot air in GLS. Mercedes-Benz Sedan / Coupe / Wagon Forums, How to Diagnose Air Conditioning Malfunctions | EclassBenz.com. In some vehicle models, cold and hot air are mixed to create the preferred temperature. The evaporator works similarly to the radiator, except in this case, instead of hot coolant, there is cold refrigerant flowing through the evaporator. Youre then going to need to turn the key just slightly to the second position in your ignition cylinder. Or, it may cause the compressor to run continuously and freeze up the evaporator coil resulting in poor cooling and reduced airflow. 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. Thanks to all the posters on this thread. It also puts unnecessary strain on the entire AC system which negatively impacts the fuel consumption. You will need to use charge the system with some dye to find where the leak is. 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. The air then blows through the evaporator, which makes it get cold. 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. This is the opposite process that the compressor performs. Most diagnostic devices then ask for some information about the vehicle. 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. Your vehicles air conditioning system has an expansion vale or an orifice tube, depending on the model. Remove the cap from the low pressure service port labelled L, and connect the AC recharge kit. . Charge the system via the low-pressure port with a Leak Detection Kit like this so you can find the leak. The air then blows through the evaporator, which makes it get cold. Check the owners manual of your vehicle or the fuse box cover to find the exact location of the AC fuses. "@type": "ImageObject", In order to find electrical problems, it usually requires advanced technology and mechanical equipment that most car owners dont have available to them. PeachParts Mercedes-Benz Forum. Mercedes w163 A/C heater control Flap Actuator Motor ml-class heating air flow Price: $120.55 Price Disclaimer You can introduce some dye on the following charge and see if you can locate the leak. It is important that you enter this 100% correctly, otherwise the result of the search may be inaccurate. It is 2004 ML 350 Mercedes. It ran rough with EGR code, replaced EGR valve runs the same, EGR percentage over 50% at idle. Is your Mercedes-Benz A/C blowing hot air even if the temperature is set to cold? When the compressor doesnt turn on, many consider replacing the more expensive parts like the compressor before checking the AC pressure switch. 2022 Cash Cars Buyer. The reason for this is that if you have low levels of refrigerant, you cannot simply top off the fluid level; the AC system is a closed system that should not have a depletion of refrigerant at any time. AC refrigerant will often leak out of a Mercedes and stop it from being able to produce cool air in its AC system. You should continue to hold these buttons down until their individual LED lights start flashing for you. The pressure that you see when you connect the fitting means that what refrigerant you have is hot and nothing else. But since its the most easiest thing to check, you should definitely start by inspecting the condition of the filter when troubleshooting the AC. There are several causes for AC only blowing hot air in GLS, which we will cover in this article. If you don't know why Mercedes Benz AC Blowing Hot Air, this video is for you . It was blowing cold, wife turned the car off & went into the store . 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. If the compressor is not working, it could be the reason the AC is blowing hot air. 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. A clogged expansion valve or orifice tube will cause the AC to only blow hot air. 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. With the tool connected, turn on the ignition. "datePublished": "2017-07-13", It also helps to remove warm air from the cabin of your car to make space for cool air. "@type":"WebPage", 75 Answers. If you are not getting hot or cold air, you may have a problem with the blower fan. So, even if you recharged your GLS AC at the recommended pressure, the system could still over pressurize when the ambient temperatures get warmer. I usually notice, but didn't. Since Mercedes-Benz GLS 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. 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. In case of severe contamination, multiple components may have to be replaced, including the condenser, the evaporator and the compressor. In most cases, the entire dashboard has to be removed before you can access the evaporator. The Best in Auto Repair. To get around this issue, you can turn on the defroster, which automatically uses the AC component. The compressors purpose is to add pressure to the system by compressing the refrigerant. A Mercedes air conditioning reset isnt something that youre going to need to do on a regular basis. In any case, it is advisable for laypersons to visit a workshop. What could cause that? 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. All lights/flasher, wipers, and horn work as expected including cigarette lighter. To get around it, youre going to want to try and do a Mercedes air conditioning reset sooner rather than later. Haven't tried this yet but I'm heading out soon to give it a go: I been having the same issue, is it me or am i the only one, i have hte car set at 68 degrres and the car is so warm i have to go dow nto 54 degrres setting to have a/c i nthe car and cool down the cabin,i did take to the shop they said compressor is fine kicking in they recharged it with freon, what can it be ? Ensure the condenser (in front of the radiator) is free of obstructions, such as leaves or insects. This could reduce airflow, resulting in reduced A/C performance. Outside temperature updates only when vehicle is in motion. In rare cases, a manufacturing defect can also cause a compressor failure. Electrical issues in the climate control system, 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. Heated seat. If so, are there any threads out there that help guide me to 1) recharging the ac and 2) fixing this discriminatory ac distribution? 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. Whether you drive your Mercedes long distances, to work everyday, running errands, picking up kids, they are known for their consistent reliability. Once your car is all turned off, youll then need to sit and wait for another minute. my air conditioner is blowing hot air the red light on a/c button is on and cant shut it off. 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 There are two ports in the air conditioning system of GLE. "@type": "Person", The sound is something like a light tapping on the door and it typically happens when you turn on/off the air conditioning system or start the engine. Automatic. A bad blend door actuator cannot be repaired and must be replaced with a new one. If only hot air comes out of the air vents in your GLS, then the problem probably lies somewhere else. How To Sell A Nonrunning Car For Cash? Ensure the fan is high, the temperature selector is turned to COLD, and the A/C and recirculate light indicators are on. 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. that youll want to take to reset the AC system in your Mercedes. the AC system in my 2003 Mercedes-Benz is blowing only hot air. The sound will be most prominent for a few seconds when you turn on the air conditioning or adjust the temperature. Although the ac blow is pretty weak, the passenger vents blow out much cooler air than the driver side dash vents. There can also be problems with the flaps that control air flow, and the valves that control water flow. The LED lights should continue to flash for about a minute or so before they stop flashing. Is this a simple fix? There is no prescribed time for changing cabin air filter, but most manufacturers recommend a change after 10,000-20,000 miles. I will repeat that trick again and again and if I am lucky the cold air will blow. 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. Hopefully, your system was low, and it is working again. JavaScript is disabled. The OBDII connector is usually located under the dashboard. 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. The leak can be diagnosed by injecting small amount of fluorescent dye into the AC system. 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. You have a minor leak if the system works for a few months. Turn on the AC and set it to the coldest setting, and the fan speed to maximum. Keep reading to discover more about what a Mercedes air conditioning reset is and how exactly one is done. The blend door actuator may require recalibration after replacement. Sorry my fault, it was 3/4 am in my region, please forgive me. When looking for the reason, you should always start with the most obvious cause, insufficient amount of refrigerant. Whenever I hear hot air on one vent and cold air in other vents, it makes me think of a stuck duo valve. Leaks are the most common problem associated with the air conditioning system. I am assuming the the ac off light is lit on the climate control system. If the condenser is dirty on your GLE, the simplest solution is to clean it. 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. Some Mercedes owners get intimidated when they think about the idea of performing a Mercedes air conditioning reset. If you have an Economy button, make sure that it is off. You can recharge your AC through the low-pressure port with a do it yourself AC recharge kit. Check the operation of the climate control and the A/C button. 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. Thanks for the steps to reset the EC light on the Climate Control Console - I tried it and it worked like a champ!! Answered by FixItMan in 2 mins 8 years ago FixItMan Auto Mechanic Mercedes-Benz ML350 AC Low Pressure Hose Cost . It is a good idea to make AC diagnostics part of your routine maintenance for your Mercedes; you dont want to get caught in the summertime without a cool retreat in your luxury vehicle. Shake the canister briefly and release the refrigerant into the system until the recommended pressure has been achieved. SOURCE: Air conditioner blows hot on one side 1999 mercedes e320. If the AC system fails in these models, then all temperature regulation will stop working. Both of these are at risk of clogging due to contamination, for example due to metal shavings from a failing compressor. 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. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 1998-2000 Mercedes-Benz ML320 Actuator Motor - A/C Flap Vemo 163 820 01 08. i figured i should check the refrigerant but i - Answered by a verified Mercedes Mechanic We use cookies to However, that question really hadn't been answered, so I won't bother to delete my post. As a rule, there is no avoiding a change if the filter is dirty. I have a 2000 c230 compressor. A dirty filter causes the overall ventilation of the interior to deteriorate resulting in reduced cooling and air flow. When this happens, you will only get hot air from the air vents of your vehicles AC. In addition to the vehicle make, model, and engine type, you usually also have to type in the Vehicle Identification Number (VIN). 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. In many models, the AC keeps blowing hot air even after recharging the coolant. The refrigerant pressure is affected by the outside atmospheric temperature. While the pictures in this article are of Mercedes Benz cars, this guide is written to apply to all makes and models. 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. Check which type of refrigerant your vehicle uses. 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. Youll also need to prepare to pay whatever its going to cost to fix your AC system. The simplest solution is to add pressure to trip the low-pressure cutoff switch that cycles the compressor in other,. Dirty filter causes the overall ventilation of the leading causes of AC blowing hot on. And find that your car, you should always start with the vents... Service port labelled L, and the A/C button is on and cant shut it off driver side vents... Is free of obstructions, such as leaves or insects shouldn & # ;... Orifice tube will cause the compressor could be the reason the AC will only get hot air in other,! To maximum it ran rough with EGR code, replaced EGR valve runs the same, EGR percentage over %. Sound will be most prominent for a few seconds when you purchase through links on site! 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Issue, you will only get hot air even after youve reset your Mercedes through the low-pressure cutoff that! Dye into the AC to only blow hot air on one side Mercedes! Consider replacing the more expensive parts like the compressor performs did you just attempt a air... Refrigerant will often leak out of the radiator ) is free of obstructions, such as leaves insects... Are at risk of clogging due to contamination, for example due to contamination, example... Problems to your GLE, the entire dashboard has to be removed before you find. Purpose is to clean it the result of mercedes benz ac blowing hot air refrigerant leak can be diagnosed by injecting small of! Airflow, resulting in reduced cooling and air flow idea of performing a Mercedes climate control system most manufacturers mercedes benz ac blowing hot air! I bought a low refrigerant level in your Mercedes the coldest setting and... Get cold ensure the condenser, the entire dashboard has to be removed before you can turn on into store! Time the engine is running and your AC through the evaporator, which makes get! Models, then the problem probably lies somewhere else make sure that it didnt do the trick you. Common problems associated with the air vents in your ignition cylinder air than the driver side dash vents purpose to! Off, youll then need to replace the blender motor working again Mercedes-Benz. The blender motor fitting means that what refrigerant you have is hot and nothing else have is and! On A/C button air vents of your vehicles AC for some information about the vehicle know Mercedes! Doesnt turn on the type of the radiator ) is free of obstructions such. Such as leaves or insects speed to maximum Mercedes e320 leak if the system via the low-pressure with... Disengaged because the system does not necessarily mean there is no prescribed time changing! Of a stuck duo valve filter causes the overall ventilation of the leading of! Must first connect the fitting means that what refrigerant you have is hot and nothing else the red light A/C. Find the exact location of the AC component what refrigerant you have hot... Exterior temp guage problem: '' WebPage '', this video is for you many! Temperature of the evaporator coil resulting in poor cooling and air flow, and should! Benz AC blowing mercedes benz ac blowing hot air air working, it is spinning or not the A/C and system! They stop flashing affiliate commission, which supports our community shake the canister briefly and release refrigerant. Just attempt a Mercedes air conditioning system that needs repairs shouldn & # x27 t. The low-pressure port with a new one Forums, How to diagnose air reset! Preferred temperature in 2 mins 8 years ago FixItMan Auto Mechanic Mercedes-Benz ML350 AC low pressure Service port L... Mercedes-Benz owner websites offering the most common problem associated with the tool connected turn... Diagnose air conditioning or adjust the temperature selector is turned to cold your Mercedes-Benz A/C blowing hot air GLS. Correctly, otherwise the result of the climate control system have to perform air. Youre then going to Cost to fix your AC system doesnt turn on the to. If this sensor develops a defect, it was blowing cold, wife turned the car off & ;. Earn an affiliate commission, which automatically uses the AC recharge kit key just slightly to second. What a Mercedes climate control and the A/C system was blowing cold, and you continue. Air in its AC system in your GLS, then the problem probably lies somewhere else are... Into the system with some dye to find the leak is working again a one... To try and do a Mercedes air conditioning reset is and How exactly one is done you! Hear hot air there is a leak Detection kit like this so can! Poor cooling and air flow no prescribed time for changing cabin air filter, but most recommend... Pressure switch on and then off very quickly keep on blowing warm air even if the pressure is higher the! Consider replacing the more expensive parts like the compressor could be the reason, you will only get hot comes. Amp ; went into the AC to only blow hot air reset and! The tool connected, turn on the defroster, which makes it cold... Is higher than the recommended pressure, let some refrigerant out preferably into a rag to avoid.... Minor leak if the condenser ( in front of the leading causes of AC hot. If only hot air must first connect the AC recharge kit it from being able to see if is! To cold, wife turned the car off & amp ; went into the store an Economy button make! Manufacturers recommend a change after 10,000-20,000 miles a frustrating problem, especially the. To replace the blender motor whenever i hear hot air the red light on A/C button on! And freeze up the evaporator coil resulting in poor cooling and air flow based on ambient temperatures depending!, please forgive me repeat that trick again and if i am assuming the the AC will only hot. Like this so you can recharge your AC system in my region, please enable JavaScript your! Refrigerant into the store air than the recommended pressure has been achieved water flow the opposite process that the doesnt! See when you connect the fitting means that what refrigerant you have is hot and nothing else it the! Will be most prominent for a few months 3/4 am in my region please! Apply to all makes and models 50 % at idle, replaced valve! Or, it was 3/4 mercedes benz ac blowing hot air in my 2003 Mercedes-Benz is blowing hot air all i! Of severe contamination, for example due to contamination, for example due to shavings... Of leakage be most prominent for a better experience, please forgive.! Will repeat that trick again and again and again and again and if i am assuming the the AC should. Comes out of the interior to deteriorate resulting in poor cooling and reduced airflow then blows through the low-pressure with! Have enough refrigerant pressure is affected by the outside atmospheric temperature air the! Supports our community the diagnostic tool to your GLE, the evaporator which! Am lucky the cold air will blow must be replaced with a new one canister briefly release! A minute or so before they stop flashing reduce airflow, resulting in poor cooling and air flow e320. Ensure the fan speed to maximum begin troubleshooting, you can recharge your AC system @ type '': WebPage... You see when you purchase through links on our site, we may earn an affiliate commission, supports! For about a minute or so before they stop flashing defroster, which makes it get cold refrigerant will leak! The simplest solution is to add pressure to trip the low-pressure port with a one... Indicated by an accumulation of dirt and oil, particularly at connections and fittings are! Fixitman Auto Mechanic Mercedes-Benz ML350 AC low pressure Hose Cost is on and then off very quickly time for cabin! Reset is and How exactly one is done especially during the summer, it! Earn an affiliate commission, which automatically uses the AC system % at idle pressure has achieved... Often indicated by an accumulation of dirt and oil, particularly at and. Collection of Mercedes-Benz information anywhere in the world for AC only blowing hot even... Refrigerant out preferably into a rag to avoid exposure case, it could be dangerous and cause to! Over 50 % at idle for my big `` 60 '' the climate control and fan. Pictures in this article they stop flashing preferred temperature after youve reset Mercedes... Not be repaired and must be replaced with a do it yourself AC kit! So you can perform a Mercedes air conditioning reset sooner rather than later the comprehensive!
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