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The Lennox 94W07 (100679-37) is a genuine OEM expansion valve designed to deliver precise refrigerant flow control in compatible Lennox heating and cooling systems. This valve plays a critical role in regulating the amount of refrigerant entering the evaporator, ensuring efficient heat exchange and stable system pressures throughout the operating cycle. Common signs of expansion valve failure include inadequate cooling or heating, erratic pressure readings, coil icing, and increased energy usage — all of which can be corrected by installing this OEM-spec replacement part.