Refrigerant Circuit Component Overview

HD = High-pressure end 

ND = Low-pressure end 

1. A/C Compressor Regulator Valve -N280-
   • Checking activation and function, refer to A/C COMPRESSOR REGULATOR VALVE, CHECKING SWITCH-ON SIGNAL ¹⁾ .
2. A/C Compressor
   • A/C compressor from bracket, removing and installing, refer to COMPRESSOR, REMOVING FROM BRACKET ¹⁾ .
   • When installing refrigerant lines/hoses and pertaining bracket, make sure there is a sufficient gap between belt, bracket and belt pulley.
   • Depending on time period of production and on engine, compressor construction type may vary.
   • At the beginning of production, A/C compressor was manufactured by Denso (type 7 SEU 16 or 7 SEU 17) were installed; from MY 2004 A/C compressors by other manufacturers (Delphi, Sanden or Zexel) may also be installed. Refer to Removal and Installation .
   • These A/C compressors are available as replacement parts with different oil fill capacities, therefore note capacity on the A/C compressor and the exact part number.
   • Depending on A/C compressor type, different refrigerant oil fill capacities are designated for the refrigerant circuit. The reason for the different oil capacities in the A/C compressor for an otherwise identical refrigerant circuit lies in the design of the A/C compressor itself, note these oil capacities. Too much oil in the circuit leads to higher pressures and reduces cooling performance of the system. Too little oil may lead to lubrication problems in the compressor.
     NOTE:

     Beginning the production year 2006, the name of the Zexel A/C compressor was changed from Zexel to Valeo.

3. Belt Pulley
   • Replace ¹⁾ , refer to A/C COMPRESSOR AND PULLEY .
   • Ribbed belt, removing and installing, refer to ¹⁾ : RIBBED BELT .
   • Ribbed belt allocation,
     NOTE:

     • There is an overload protection installed between the belt pulley and the A/C compressor input shaft to protect the belt should the A/C compressor get blocked or be difficult to move.
     • If the A/C compressor is runs with resistance, the overload safeguard interrupts the supply of power to it.
     • Rubber elements are installed between belt pulley and A/C compressor driveshaft, vibrations which may occur during A/C compressor operation may be dissipated via these rubber elements (damper function at torque fluctuations).
     • Depending on compressor type, different belt pulleys are installed on compressor, refer to A/C COMPRESSOR AND PULLEY .
     • The Delphi A/C compressor belt pulley cannot be removed separately.
4. Oil Drain Plug
5. Pressure Relief Valve
6. Connection With Valve
   • Different component locations depending on engine, item 6a shows component location e.g. in vehicles with 2.0 L Diesel engine.
7. High Pressure Sensor -G65- ¹⁾
   • Removing and installing, refer to HIGH PRESSURE SENSOR .
   • Checking signal, refer to HIGH PRESSURE SENSOR, CHECKING PRESSURE SIGNAL .
   • Different component locations depending on engine, item 7a shows component location e.g. in vehicles with 2.0 L Diesel engine.
8. Condenser
   • In vehicles with rough terrain equipment, an additional stone deflector may be installed in lower area.
9. Fluid Reservoir
   • Fluid reservoir is mounted directly on the condenser.
10. Service Connection
    • High pressure side.
    • Different versions (with primary sealing valve or with Schrader valve) depending on refrigerant line, distinguishing characteristics, refer to CONNECTIONS FOR QUICK-RELEASE COUPLING ON REFRIGERANT CIRCUIT .
    • For the A/C service station to measure pressures, to discharge and recharge the refrigerant circuit, refer to A/C SERVICE STATION .
    • Depending on engine version, it may be necessary to remove some components (e.g. EVAP canister) in order to be able to connect to service coupling.
      WARNING:

      Only remove service connections when the refrigerant circuit is empty. The connection does not have a valve.

11. Sealing Cap
    • With a seal.
    • Always screw on.
12. Expansion Valve
13. Evaporator
14. Service Connection
    • Low pressure side.
    • Different versions (with primary sealing valve or with Schrader valve) depending on refrigerant line, distinguishing characteristics, refer to CONNECTIONS FOR QUICK-RELEASE COUPLING ON REFRIGERANT CIRCUIT .
    • For the A/C service station to measure pressures and to discharge the refrigerant circuit, refer to A/C SERVICE STATION .
    • Depending on engine version, it may be necessary to remove some components (e.g. EVAP canister) in order to be able to connect to service coupling.
      WARNING:

      Only remove service connections when the refrigerant circuit is empty. The connection does not have a valve.

15. Sealing Cap
    • With a seal.
    • Always screw on.
16. Pre-Volume
    • Is a component of refrigerant line from expansion valve to A/C compressor.
    • Pressure fluctuations are damped in the pre-volume.
    • Not installed in all vehicles (currently not installed on the 2.0L diesel engine).
17. Connection In Refrigerant Line
    • Not installed on all vehicles (currently, for example, installed on 6-cylinder vehicles).