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Ford Explorer Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
Its essentially a flow regulator for freon moving into the evaporator. It also has a fine mesh filter which can clog. Some cars don't have an orifice tube, but have an expansion valve.