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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
Welcome to this forum! I've renamed your thread, and moved it into the A/C & heater section. The valve has an inlet, and a outlet. It's not a check valve, so just install the new valve onto the two hoses.
It installs in the outer most (closest to fender) hose with the arrow pointing away from the firewall. The vacuum port should be furthest away from the firewall.
No, it's not a check valve but it does flow better in one direction than the other, hence the arrow.