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Ford Explorer Community - 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
That looks like the vacuum hose for the "heater control servo". The "servo" will be "in-line" one of your heater hoses. The valve opens and closes to allow the engine coolant water flow to or from the heater core as you turn the temperature control knob on the heat/ac control inside the cab.