Heat Pump Operation Heater Core
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2018 Audi S6, 2018 Audi A6 Quattro, 2018 Audi A6, 2017 Audi S6, and 2017 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
The gaseous or vaporous refrigerant that is compressed by the A/C compressor becomes a liquid in the heater core -A-. At the same time, the heat that is released is transferred to the coolant flowing by. Refer to REFRIGERANT CIRCUIT [For engine(s) CTUA, CAED, CREH, CEUC, CTGE, CREC, CYNB, CPNB]