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To charge the rear AC on an F-450 bus, first ensure the engine is running and the AC system is set to maximum cool. Connect the refrigerant gauge set to the low-pressure service port, typically located near the accumulator. Add refrigerant slowly while monitoring the pressure readings to prevent overcharging, and check for any leaks in the system. Once the proper pressure is achieved and the system is cooling effectively, disconnect the gauges and replace any service port caps.

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