A/C ECU (controller) is under the back seat bottom, remove metal cover to inspect.
Actual A/C compressor is in the front and under the car. Fully electric, no belts, runs off 330v traction battery. R134a refrigerant. Special non-conductive refrigerant oil because the electric motor is built into the a/c compressor.
Heater controller Assembly is built into the control knobs in the center dash.
PTC water heater for the passenger compartment HVAC is also located in the front of the vehicle and under the car. Uses coolant. Reservior is under the hood. Also runs off 330v traction battery.