High Pressure Relief Valve
WARNING: This page is about a different car, the 2014 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.
A high pressure relief valve is located on the compressor cylinder head at the rear of each A/C compressor. Refer to COMPRESSOR, A/C, DESCRIPTION . This mechanical valve is designed to vent refrigerant from the A/C system to protect against damage to the A/C compressor and other A/C system components caused by condenser air flow restriction or an overcharge of refrigerant.