Audi Q5: A/C Compressor Regulator Valve -N280-
Note
Switch pressures, removing and installing switches as well as switch arrangement and version. Refer to vehicle specific refrigerant circuit → Heating, Ventilation and Air Conditioning; Rep. Gr.87; System Overview - Refrigerant Circuit (vehicle-specific repair manual).
The regulator valve is implemented into the compressor. It is controlled by the Front A/C Display Control Head -E87-, the A/C control Module -J301- or the Climatronic Control Module -J255- (depending on the vehicle, possibly via the databus of the an additional control module). Refer to → Heating, Ventilation and Air Conditioning; Rep. Gr.87; System Overview - Refrigerant Circuit (vehicle-specific repair manual). Pressure on the low pressure side is influenced via the regulator valve and thus regulates the temperature in the evaporator.
Note
The A/C Compressor Regulator Valve -N280- is a component of the A/C compressor and cannot be replaced separately on all A/C compressors. Refer to the Parts Catalog and → Chapter "A/C Compressor Regulator Valve -N280-, Removing and Installing".
A/C Compressor -G111-
Note
Switch pressures, removing and installing switches as well as switch arrangement and version. Refer to vehicle specific refrigerant circuit → Heating, Ventilation and Air Conditioning; Rep. Gr.87; System Overview - Refrigerant Circuit (vehicle-specific repair manual).
Inductive sensor
The sensor pulses (4 per compressor revolution) and the engine speed enable the Front A/C Display Control Head -E87- or the Climatronic Control Module -J255- to calculate belt slip.
If the belt slip exceeds a specified value, the compressor is switched off by the control module via the A/C clutch.
Note
- Installed in Audi vehicles with an A/C compressor driven the a ribbed belt and with Zexel compressor. Refer to → Heating, Ventilation and Air Conditioning; Rep. Gr.87; System Overview - Refrigerant Circuit (vehicle-specific repair manual).
- Beginning from production year 2006, the name of the "Zexel" A/C compressor was changed from "Zexel" to "Valeo".
Refrigerant Temperature Sensor -G454-
The refrigerant temperature sensor (with a temperature-dependent resistance) is for example installed in the high pressure line near the A/C compressor (only for specified time period for example on the Audi Q7 from MY 2007).
In the refrigerant circuit, there is a direct correlation between temperature and pressure. Should there be too little refrigerant in the refrigerant circuit, the temperature in the refrigerant circuit rises more strongly than intended for this pressure when A/C system is operating.
Note
Switch pressures, removing and installing switches as well as switch arrangement and version. Refer to vehicle specific refrigerant circuit → Heating, Ventilation and Air Conditioning; Rep. Gr.87; System Overview - Refrigerant Circuit (vehicle-specific repair manual).
Note
- Installed for example on the Audi Q7 with specific engines. Refer to → Heating, Ventilation and Air Conditioning; Rep. Gr.87; System Overview - Refrigerant Circuit (vehicle-specific repair manual) and → Wiring diagrams, Troubleshooting & Component locations.
- The Climatronic Control Module -J255- evaluates pressure and temperature in the refrigerant circuit and switches off the compressor in the event the temperature increases above the value stored for this pressure. Refer to → Heating, Ventilation and Air Conditioning; Rep. Gr.87; System Overview - Refrigerant Circuit (vehicle-specific repair manual) and Vehicle Diagnostic Tester ("OBD" or "Guided Fault Finding for the A/C system").
Electrical Components not on Refrigerant Circuit
Coolant Fan Control Module -J293-
This control module switches on and off the A/C clutch and therefore the A/C compressor. It turns on the radiator fan and calculates the refrigerant circuit pressure in vehicles with a High Pressure Sensor -G65-. Refer to → Wiring diagrams, Troubleshooting & Component locations and → Heating, Ventilation and Air Conditioning; Rep. Gr.87; Component Location Overview - A/C System (vehicle-specific repair manual).
