A-AR49961-AI Expansion ValveOne New Aftermarket Replacement Expansion Valve Fits John Deere Tractors and Equipment This aftermarket replacement expansion valve is a key component of the cab air conditioning system on Fits John Deere (Fits JD) tractors and other compatible equipment. The expansion valve meters refrigerant flow into the evaporator, regulating pressure and temperature to maintain effective cooling in the operator cab. This is an internally equalized thermostatic