Refrigerant Cut-Off Valve
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2015 Audi S7, 2015 Audi RS 7, 2015 Audi A7 Quattro, 2014 Audi S7, and 2014 Audi RS 7. However, it is still accessible from the selected car via links, so may be relevant.
There are various designations, depending on the function and the vehicle. Refer to [For engine(s) CTUA, CEUC, CRDB, CGXB, CPNB] System Overview - Refrigerant Circuit (vehicle-specific repair information).
- Hybrid Battery Refrigerant Shut-Off Valve 1 -N516- (for example the Audi Q5 Hybrid)
- Heater and A/C Unit Refrigerant Cut-Off Valve -N541-
- High Voltage Battery Heater Core Refrigerant Cut-Off Valve -N542-
- If the shut-off -A- is not activated by the electronics, it is open and lets the refrigerant flow through to the evaporator in the A/C unit.
- The shut-off valve -A- is installed on vehicles with the battery cooling module. It is activated in hybrid mode when no A/C system operation is desired for the passenger compartment or for the Hybrid Battery Unit -AX1-, but is necessary for battery cooling.
- Observe the arrow -B- attached to the shut-off valve -A-, which shows the flow direction of the refrigerant (from the condenser to the evaporator in the A/C unit)
- The solenoid coil -C- attached to the shut-off valve is activated for example from the Battery Regulation Control Module -J840- appropriate SYSTEM WIRING DIAGRAMS information. Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" Function for the A/C System and the Battery Regulation.
- On a vehicle with two evaporators (one in the A/C unit and one for example on the Audi Q5 Hybrid) in the battery cooling module, if the measured temperature on one of the evaporators corresponds to the target value or the target value falls short, but does not reach the required target value on the other evaporator, the following adjustment is performed: the relevant control module (for example the Battery Regulation Control Module -J840- n the Audi Q5 hybrid) activates the electric A/C compressor with increased speed (thereby increasing the A/C cooling output and decreasing the pressure on the low pressure side as well as the evaporator temperature) via the A/C Compressor Control Module -J842-. If the target value falls short for the temperature of one of the evaporators, the relevant control module (for example the Battery Regulation Control Module -J840- on the Audi Q5 Hybrid the Hybrid Battery Refrigerant Shut-Off Valve 1 -N516- or the Hybrid Battery Refrigerant Shut-Off Valve 2 -N517-) activates so that the evaporator which is too cold is no longer supplied with refrigerant. Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" Function for the A/C System and [For engine(s) CTUA, CEUC, CRDB, CGXB, CPNB] System Overview - Refrigerant Circuit (for the specific vehicle).