A method for starting-up a vehicle air-conditioning system, comprising: at the vehicle air-conditioning system including a blower fan , a condenser fan , and a compressor , all of which are electrically coupled to a battery system : while the condenser fan and compressor are off, starting the blower fan ; after starting the blower fan , measuring a first current drawn from the battery system , wherein the first current is indicative of current drawn by the blower fan ; in accordance with a determination that the first current meets one or more predefined criteria, starting the condenser fan while leaving the compressor off; after starting the condenser fan , measuring a second current drawn from the battery system , wherein the difference between the second current and the first current is indicative of current drawn by the condenser fan ; and in accordance with a determination that the second current, or the difference between the second current and the first current, meets one or more predefined second criteria, starting the compressor , wherein the one or more predefined second criteria are based on an operating state of the condenser and the current drawn by the condenser fan, and wherein the one or more predefined criteria differ from the one or more predefined second criteria. at the vehicle air-conditioning system including a blower fan , a condenser fan , and a compressor , all of which are electrically coupled to a battery system : while the condenser fan and compressor are off, starting the blower fan ; after starting the blower fan , measuring a first current drawn from the battery system , wherein the first current is indicative of current drawn by the blower fan ; in accordance with a determination that the first current meets one or more predefined criteria, starting the condenser fan while leaving the compressor off; after starting the condenser fan , measuring a second current drawn from the battery system , wherein the difference between the second current and the first current is indicative of current drawn by the condenser fan ; and in accordance with a determination that the second current, or the difference between the second current and the first current, meets one or more predefined second criteria, starting the compressor , wherein while the condenser fan and compressor are off, starting the blower fan ; after starting the blower fan , measuring a first current drawn from the battery system , wherein the first current is indicative of current drawn by the blower fan ; in accordance with a determination that the first current meets one or more predefined criteria, starting the condenser fan while leaving the compressor off; after starting the condenser fan , measuring a second current drawn from the battery system , wherein the difference between the second current and the first current is indicative of current drawn by the condenser fan ; and in accordance with a determination that the second current, or the difference between the second current and the first current, meets one or more predefined second criteria, starting the compressor , wherein the one or more predefined second criteria are based on an operating state of the condenser and the current drawn by the condenser fan, and wherein the one or more predefined criteria differ from the one or more predefined second criteria. <EOS>