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.

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Certification and Standards: Check if the hose meets industry standards and certifications, such as Society of Automotive Engineers (SAE) or International Organization for Standardization (ISO) specifications. Compliance with these standards ensures that the hose meets quality and safety requirements.