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The Bard 905-0639 Cooling TXV Assembly is an OEM thermostatic expansion valve assembly used in Bard wall-mounted air conditioners and heat pump systems to meter refrigerant into the evaporator and maintain proper superheat for stable cooling and dehumidification. A weak or restricted TXV can cause issues like poor capacity, coil icing, or abnormal suction pressures, so replacing it with the correct Bard OEM assembly helps restore designed refrigerant control and overall system performance. Verify compatibility by matching the part number to your unit model and serial, and follow standard refrigeration service practices for recovery, evacuation, and leak checking during installation.