General Description - Refrigerant Circuit Components: Evaporator: Notes
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 evaporator is available in different versions. Depending on the design and the function, the heat energy of the flowing air needed (for example, an evaporator in the heater and A/C Unit or in the battery cooling module) or flowing coolant needed (for example near the high-voltage battery heat exchanger) is extracted for refrigerant evaporation. Refer to REFRIGERANT CIRCUIT [For engine(s) CTUA, CAED, CREH, CEUC, CTGE, CREC, CYNB, CPNB]
NOTE:
Two versions of the evaporator are described.
Evaporator in the Heater and A/C Unit (or in the Battery Cooling Module)
- The liquid refrigerant evaporates in the evaporator pipe -A-. The heat required for this is extracted from the air flowing on the evaporator ribbing -B-. The air cools off. Refrigerant evaporates and is extracted with the absorbed heat by the A/C compressor
- A definite quantity or refrigerant is supplied to the evaporator through an expansion valve (a restrictor). In systems with an expansion valve, the flow rate is regulated so that only gaseous refrigerant escapes the evaporator outlet.
- With the introduction of the refrigerant R1234yf the evaporator is adapted to the refrigerant, for this reason pay attention to the version. Refer to the Parts Information.