- HD = high pressure side
- ND = low pressure side
The arrows indicate the direction of refrigerant flow.
1. Air conditioning compressor control valve-N280-
2. Climate compressor, installations. Remove the compressor from its mount and install it again (for vehicles with 4-cylinder engine) engine and 6-cyl. TDI engine. For vehicles with 6-cyhp an FSI petrol engine, the compressor can only be removed from the bracket after the refrigerant has been drained from the circuit. At the beginning of production, company compressors are installed "Denso" (type "6 SEU14" on vehicles with 4-cyl. and 6-cyl. engine). It is possible that compressors from other manufacturers will be installed later. Compressors may vary depending on production date and engine. These compressors as spare parts have different oil volumes, so pay attention to the oil volume in the compressor and the exact part number. Depending on the type of compressor, the refrigerant circuit may have different compressor oil charges. The basis for different amounts of oil in the compressor with a refrigerant circuit similar in other respects is the design of the compressor itself; take into account the amount of oil. Too much oil content in the refrigerant circuit leads to unacceptably high pressure and a decrease in the cooling capacity of the climate control system. Insufficient oil can cause lubrication problems with the air conditioning compressor. When installing the refrigerant lines and associated holders, ensure sufficient distance between the belt, holder and belt pulley. From model year 2012 on certain vehicles with 4-cyl. The engine is gradually introducing a climate compressor, installations on which an electromagnetic climate control clutch is additionally installed, installations -N25-. With the help of this magnetic clutch, the drive of the air conditioning compressor is completely switched off under certain operating modes, climate, settings (for example, in operating mode "Esop"). In order for -N25- to receive control signals from the operating and display unit, the Climatronic control unit -J255-, the correct version -J255- must be installed and correctly coded
3. Belt pulley/drive module for air conditioning compressor/belt pulley with magnetic clutch -N25-. Replace the belt pulley together with the magnetic coupling -N25-. Valid for certain vehicles with 4-cyl. engine from model year 2012. An overload protection is installed between the pulley/drive module and the compressor drive shaft to protect the belt/drive module in case of blocking and difficult operation of the compressor. Overload protection stops the transmission of force to the compressor when running difficult. Rubber elements are installed between the pulley/drive module and the compressor drive shaft, which dampen vibrations that can occur during compressor operation (damping function for torque fluctuations). Depending on the type of compressor and engine, different belt pulleys are installed on the compressor. From model year 2012 on certain vehicles with 4-cyl. The engine is gradually introducing a climate compressor, installations on which an electromagnetic climate control clutch is additionally installed, installations -N25-. With the help of this magnetic clutch, the drive of the air conditioning compressor is completely switched off under certain operating modes, climate, settings (for example, in operating mode "Esop"). In order for -N25- to receive control signals from the operating and display unit, Climatronic control unit -0255-, the correct version of -J255- must be installed and the correct mode coding must be carried out
4. Oil drain plug
5. Overpressure valve
6. Connection with valve
7. Refrigerant temperature and pressure sender -G395-. The refrigerant temperature and pressure sender -G395- communicates via a local bus with the used vehicle electrical system -J519-. -J519- sends the data to the Climatronic control unit -J255-. Therefore, the high pressure sender -G65- cannot be installed on this vehicle (outputs only square wave signals). The temperature measured by the refrigerant pressure and temperature sensor -G395, due to the design -G395- and its installation location, differs from the actual refrigerant temperature in the refrigerant circuit and is therefore not currently interpreted and is not used for climate control, installation
8. Capacitor
9. Dryer tank. The tank is installed directly on the condenser
10. High pressure side refrigerant line quick connect
11. Cap with seal. Always close
12. Service connector in the high pressure circuit. Various executions (with primary seal valve or nipple) depending on the refrigerant line, distinctive features. For climate control, service station for measuring pressure, emptying and filling the refrigerant circuit. Depending on the engine version, it may be necessary to remove some elements in order to connect the service connector. Depending on the location of the service connector on the refrigerant line and the vehicle model, it may be necessary to remove the left additional extension reinforcement to connect the service connector of the service station
13. Refrigerant line with internal heat exchanger. This line contains liquid warm refrigerant (on the pressure side) releases energy to the cold vapor refrigerant (on the low pressure side), thereby increasing the efficiency of the climate, installations
14. Expansion valve
15. Evaporator
16. Low pressure side refrigerant line quick connect
17. Cap with seal. Always close
18. Service connection in the low pressure circuit. Various executions (with primary seal valve or nipple) depending on the refrigerant line. Depending on the engine version, it may be necessary to remove some elements in order to connect the service connector
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