The low pressure AC connection on a 2010 Dodge Avenger is located on the larger diameter aluminum line, which runs from the compressor to the evaporator. You can typically find it near the front of the engine bay, close to the driver's side. It is usually capped with a blue or black plastic cap. To avoid any confusion, ensure the engine is off and the AC system is not under pressure before attempting to locate or connect to it.
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