![]() If that unit detects an error it will not engage the A/C compressor to avoid it getting damaged. Remember that the A/C clutch is controlled by the A/C Control Unit. If it doesn’t do not assume that the A/C compressor itself is the problem. When the A/C system does not blow cold air the first thing that you show check is if the compressor engages. Why your air conditioner clutch doesn’t engage? The following video explains how the clutchless variable displacement A/C compressors work. You will not be able to check the operation of the A/C compressor clutch on such compressors because there isn’t one. A clutchless variable displacement A/C compressor can be found on models such as W203 C-CLass and W211 E-Class. ![]() Mercedes-Benz has started using clutchless variable displacement A/C compressors on many late models. Clutch-Less Variable Displacement AC Compressor The serpentine belt rides the A/C compressor pulley every time the engine runs, but the A/C compressor is working only when the A/C clutch engages it. Once you turn on the AC in the center part of the compressor, the AC clutch should engage and start to rotate with the pulley. The center part on the pulley of the A/C compressor will not spin when you have the air conditioner off or if there is a problem. The center part (the clutch) should be engaged and should be spinning along with the pulley. Now, look at the pulley of the air conditioner compressor.Open the hood and look at the serpentine belt to locate the AC compressor.How to tell if your air conditioner AC compressor clutch is working/engaging? This video is helpful if you are trying to troubleshoot air conditioner problems, the A/C compressor clutch in particular. Test if the A/C compressor clutch is engaging If there are error codes on the A/C Control Unit the compressor will not engage and you will need to reset the fault codes using a diagnostic scanner such as the YOUCANIC full system scanner. The A/C compressor clutch engages to create high pressure in the refrigerant and its state is controlled by the Air Conditioner Control Unit. By compressing the refrigerant we add pressure to the system. Otherwise, the A/C compressor engages and starts to compress the refrigerant. If no problems are detected such as low refrigerant in the system, it sends a signal to disengage the A/C compressor clutch. When you turn on the A/C, the clutch engages and the pistons start to compress the refrigerant. The Air Conditioner control unit starts gathering input from an array of sensors on your Mercedes-Benz. Every time you want cold air to blow on your Mercedes-Benz cabin you turn on the climate control and set your desired temperature. While the A/C compressor on your Mercedes-Benz is an important part of the system, the A/C compressor clutch is even more important. It is important to understand how to check if the A/C compressor is engaging or not. One crucial element of the A/C compressor is the clutch. The A/C compressor is the heart of the system. Any injury, damage or loss that may result from improper use of the tools, equipment, or the information contained in this video is the sole responsibility of the user and not World Mechanics.The A/C system on your Mercedes-Benz includes many sensors and components including the air conditioner compressor. Information given in this video does not guarantee the desired outcome. We, World Mechanics, are not responsible for property damage or injury incurred as a result of any of the information contained in this video. LIKE & SUBSCRIBE for MORE DIY VIDEOS that could SAVE YOU BIG $$$$$$$ You can check out the playlist right here:ġ998 Mercedes Serpentine Belt Replacement M元20 M元50 ML430 ML500ġ999 Mercedes Serpentine Belt Replacement M元20 M元50 ML430 ML500Ģ000 Mercedes Serpentine Belt Replacement M元20 M元50 ML430 ML500Ģ001 Mercedes Serpentine Belt Replacement M元20 M元50 ML430 ML500Ģ002 Mercedes Serpentine Belt Replacement M元20 M元50 ML430 ML500Ģ003 Mercedes Serpentine Belt Replacement M元20 M元50 ML430 ML500Ģ004 Mercedes Serpentine Belt Replacement M元20 M元50 ML430 ML500Ģ005 Mercedes Serpentine Belt Replacement M元20 M元50 ML430 ML500 We have more videos on W163 Common Repairs. We just removed the fan so we can show you better otherwise there is no room to make a Video for you. You can install the new belt through the fan. We had the Fan OFF but you DO NOT HAVE TO remove the fan. In this video we are showing you how to install the serpentine belt on Mercedes W163 equipped with either the V8 or V6 Gas engine. Serpentine Belt Replacement Install and Belt Diagram Mercedes W163 M元20 ML430 ML500 M元50
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