On a 2007 Lincoln MKX, the freon valve, also known as the service port for the air conditioning system, is typically located on the larger diameter AC line, which is the low-pressure side. This line runs from the compressor to the evaporator. The valve itself is usually found near the front of the engine bay, close to the firewall. For precise location, it's advisable to consult the vehicle's service manual or a repair guide.
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