How do you recharge ac on Ford F-150?
Buy a kit at Wal-Mart or auto parts store - comes with instructions
The black or silver can is the accumulator/drier, located near the firewall on the pass anger side. It has two AC hoses connected to it and a low side recharge port with a dust cap on it. Remove the dust cap (if it is still present) and connect your recharge kit to the port. When done replace the cap.