Four Seasons' expansion devices are specifically calibrated to provide proper flow to the evaporator as well as restricting or modulating high pressure liquid causing a pressure drop to lower the refrigerant temperature. They also provide optimum cabin comfort for both the driver and passengers.

• Block Valves are aluminum construction; all internal parts are designed to OE specifications
• Internally and Externally Equalized Valves are copper and brass construction
• Tubes to Cap connections are double soldered to insure integrity
• Coverage includes both forward and reverse flow designs
• Tonnage and Superheat is matched to OE specifications
• Power valve is seasoned for 30 days, assembled and 100% function tested prior to shipping

Expansion Valves regulate refrigerant flow within the system. Other than the Compressor, this is the only other moving part in the system.

• Expansion Valves can become contaminated with system debris
• Expansion Valves cannot be flushed and should be replaced whenever the Compressor is replaced

A Premium Variable Orifice Valve (VOV) is designed to change outputs based on different operating conditions. This significantly improves A/C performance at low speeds and idle, by allowing more refrigerant to flow.