HVAC System Service Mode
The vehicle uses two separate circuits, one circuit for the evaporator situated in the HVAC assembly for the cabin environment, and an additional circuit for the HV battery heat exchanger.
Both of these circuits have solenoid valves controlled by the thermal controller module. During A/C evacuation and recharge, it is important to open these solenoids manually (Service Mode). This will ensure that all refrigerant is removed and replaced from both circuits during evacuating and recharge of the air conditioning system.
WARNING:
HVAC Service Mode must be initiated by either Toolbox or Service Mode UI before any evacuation or recharge procedures are performed.
With the vehicle in Service Mode, the refrigerant can be recovered or recharged. The HVAC system will stay in Service Mode until the mode is exited by using Toolbox or Service Mode UI.
NOTE:
When in Service Mode, all normal HVAC system operation is disabled apart from operation of the battery coolant pump.