the electric heater when the engine is off. (2) The " low-temperature " loop removes heat from the electric drive system and has a heat exchanger for the transmission. (3) The battery cooling loop uses a 12volt electric pump to circulate coolant through the high-voltage battery pack. This third loop includes a " chiller " (heat exchanger that is integrated with an A/C loop - A/C turns on if needed to assist battery pack cooling). The ATC air conditioning uses a high-voltage electric scroll compressor (Figure 4). So, like other vehicles with an all-electric drive mode, even if limited to short range, this Jeep Wrangler requires a careful approach to service. Unlike the remotely mounted, watercooled condenser in the Fiat-produced Jeep Renegade, the one in the Wrangler plug-in is conventionally mounted at the front, ahead of the radiator and is air-cooled. v Figure 2: Remove the cover, which serves as part of the high-voltage interlock loop (HVIL) and a microswitch opens the battery pack circuit. Also shown are test points and high-voltage circuit fuses: (5) the Power Inverter Module (PIM) and (7) On Board Charging Module (OBCM). Figure 3: The Wrangler plug-in has three cooling systems: (1) high-temperature coolant through engine and radiator; (2) low-temperature loop that removes heat from the electric drive system; (3) battery cooling loop. May 2022 2 Figure 4: Wrangler plug-in's A/C system uses an electric-motor-driven compressor. Labeled are (1) mounting bolt; (2) refrigerant lines; (3) compressor. MACS Service Reports techauthority.com techauthority.com techauthority.comhttp://www.techauthority.com http://www.techauthority.com http://www.techauthority.com