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Mobile Air Conditioner's (MAC) are becoming part of every mobility solution, both for goods and people. Developed nations have started reigning in the side effects for inevitable use of refrigerants during usage and service. The most stringent and current regulation related to servicing of MAC is SAE J2788 for R134a refrigerant. This paper will discuss the parameters influencing AC service and challenges there by. The SAE J standard mandates recharge accuracy of ±15°g at 21 to 24°C temperature on Chevy Suburban for a target charge quantity of 1360 g. Though the standard is limited to testing condition at laboratory temperature, actual conditions in a service workshop would demand higher degree of fine tuning to meet efficient functioning of MAC, despite many controllable and uncontrollable variables. This paper would examine some of such variables and technological approaches adopted in achieving the above requirements.