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Evacuation and Charging: After installing the hoses, perform an evacuation process to remove any air and moisture from the system. Then, charge the air conditioning system with the appropriate refrigerant according to the manufacturer's guidelines.

In conclusion, there are four different sizes for auto A/C hose in the most common car air conditioning system. If the vehicle is a bus or coach, it will be a bigger A/C hose, like 7/8 inch and 1 1/8 inch. Make sure which part of A/C hose is broken, like hose from compressor to condenser, you can know the exactly hose size.