Refrigerant Circuit Component Overview
Refrigerant Circuit Component Overview
• Service activities on the refrigerant circuit are divided into two categories.
- All work or components marked with 1) can be repaired, replaced or performed in any workshop (work that does not pertain to refrigerant circuit).
- All refrigerant circuit components not marked with 1) and all refrigerant hoses and refrigerant lines can only be serviced or replaced in a workshop with the necessary tools and qualified personnel => [ Refrigerant Circuit ] Refrigerant Circuit => Refrigerant R134a - Servicing.
HD = High-pressure end
ND = Low-pressure end
1 A/C Compressor Regulator Valve (N280)
• Checking activation and function => [ A/C Compressor Regulator Valve, Checking Activation Signal ] Testing and Inspection 1)
2 Compressor
• Different versions (depending on the engine).
• Removing compressor with pulley from bracket and reinstalling (vehicles with 6 cylinder engine) => [ Compressor with Pulley, Removing and Installing at Bracket ] Compressor with Pulley, Removing and Installing at Bracket 1)
• Removing compressor with drive unit (shaft) from bracket and re-installing (vehicles with 8-cyl. engine) => [ Compressor, 8-Cylinder ]
• Refrigerant line, disconnecting from compressor and connecting => [ Refrigerant Lines, Disconnecting and Connecting at Compressor ] Refrigerant Lines, Disconnecting and Connecting at Compressor
• When installing refrigerant pipes and the corresponding bracket, make sure there is adequate distance between the belt, bracket and pulley.
• Compressor, Removing and Installing (vehicles with 6 cylinder engine) => [ Compressor, 6-Cylinder ]
• Compressor, Removing and Installing, (vehicles with 8 cylinder engine) => [ Compressor, 8-Cylinder ]
• Compressor, Removing and Installing, (vehicles with 10 cylinder engine) => [ Compressor, 10-Cylinder ] Compressor, 10-Cylinder
3 Compressor belt pulley/drive unit
• Different versions (depending on the engine).
• Replacing compressor belt pulley (vehicles with 6 cylinder engine) 1).
• Ribbed belt, removing and installing 1)
• Replacing compressor drive unit (vehicles with 8 or 10 cylinder engine) => [ Compressor Drive Unit ] Compressor Drive Unit
• An overload safeguard is installed between the pulley and the compressor driveshaft, this protects the compressor belt in the event that the compressor seizes or does not move freely.
• An overload safeguard is installed between drive unit and driveshaft of compressor to protect engine chain drive in the event compressor is seized or does not move freely.
• If compressor is runs with resistance, overload safeguard interrupts power transmission to compressor.
• Rubber elements are installed between belt pulley/drive unit and compressor driveshaft, vibrations which may occur during compressor operation may be dissipated via these rubber elements (damper function at torque fluctuations).
4 Oil drain plug
5 High pressure relief valve
6 Condenser
7 Connection with valve
8 A/C Pressure/Temperature Sensor (G395)
• Removing and installing => [ A/C Pressure/Temperature Sensor ] A/C Pressure/Temperature Sensor
• Housing color: "gray"
• Checking the signal => Vehicle Diagnosis, Testing and Information System VAS 5051.
• The A/C pressure/temperature sensor (G395) measured values can be read out in two different display groups via the "read measured values block" function => Vehicle Diagnosis, Testing and Information System VAS 5051 in the "Guided Fault Finding" function.
• The A/C pressure/temperature sensor (G395) exchanges information with the Climatronic Control Module (J255) via the "Lin Bus" A/C data bus system. A high pressure sensor (G65) cannot be installed on the Audi A6 (it only delivers square-wave signals).
• The temperature measured by the A/C pressure/temperature sensor (G395) differs from the actual refrigerant temperature in the refrigerant circuit because of the A/C pressure/temperature sensor (G395) design and its component location. Because of this, it is not currently evaluated and is not used to regulate the A/C system.
9 Service connection
• High pressure side
• Different versions (with primary sealing valve or with Schrader valve) depending on refrigerant line, distinguishing characteristics => Refrigerant R134a - Servicing
• To measure, drain and fill, in workshops that have the necessary tools and qualified personnel => Refrigerant R134a - Servicing.
CAUTION!
Only remove service connections when the refrigerant circuit is empty. The connection does not have a valve.
10 Cap
• With seal
• Always screw on
11 Union in refrigerant pipe (with restrictor)
• The threaded connection may only be open when refrigerant circuit is empty; bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel => Refrigerant R134a - Servicing.
12 Restricter
13 Refrigerant line threaded connection (to evaporator)
• The threaded connection may only be open when refrigerant circuit is empty; bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel => Refrigerant R134a - Servicing.
14 Refrigerant line threaded connection (at the evaporator)
• The threaded connection may only be open when refrigerant circuit is empty; bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel => Refrigerant R134a - Servicing.
15 Evaporator
16 Service connection
• Low pressure side
• Different versions (with primary sealing valve or with Schrader valve) depending on refrigerant line, distinguishing characteristics => Refrigerant R134a - Servicing
17 Cap
• With seal
• Always screw on
18 Reservoir