Overview - A/C Compressor Power Unit, 4-Cylinder Engine

Fig 1: Exploded View Of A/C Compressor Power Unit (4 Cylinder Engine)

Courtesy of AUDI OF AMERICA, LLC

Ribbed Belt
- Check for wear
- Removing and Installing. Refer to RIBBED BELT, REMOVING AND INSTALLING .
- Mark the running direction and install on the proper side. Refer to RIBBED BELT, REMOVING AND INSTALLING .
Sub-Assembly Bracket
- Removing and Installing. Refer to SUB-ASSEMBLY BRACKET, REMOVING AND INSTALLING .
  NOTE:
  There are different versions, depending on the engine. Refer to the Parts Information.
O-Ring
- Replace. Refer to the Parts Information for the version.
- Coat with refrigerant oil before installing. Refer to REFRIGERANT CIRCUIT SEALS .
Bolt
- Tightening specification. Refer to OVERVIEW - CONDENSER, A/C COMPRESSOR, REFRIGERANT LINES AND EXPANSION VALVE .
High Pressure Side Refrigerant Line
Low Pressure Side Refrigerant Line
Bolt
- Tightening specification. Refer to OVERVIEW - CONDENSER, A/C COMPRESSOR, REFRIGERANT LINES AND EXPANSION VALVE .
O-Ring
- Replace. Refer to the Parts Information for the version.
- Coat with refrigerant oil before installing. Refer to REFRIGERANT CIRCUIT SEALS .
A/C Compressor Regulator Valve -N280-
- To check, use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function. Refer to the appropriate Wiring Diagram.
  NOTE:
  Certain malfunctions at the A/C Compressor Regulator Valve A/C Compressor Regulator Valve -N280- (for example, a stuck valve or a short circuit in the coil) can lead to a complaint regarding the A/C compressor (A/C system is not cooling, the evaporator ices over, etc.). If the A/C Compressor Regulator Valve -N280- (and not the A/C compressor itself) is the cause, the A/C compressor can be serviced by replacing the A/C Compressor Regulator Valve -N280-. Refer to Refrigerant Circuit Components, Replacing or COMPONENTS, REPLACING .
  
  The A/C Compressor Regulator Valve -N280- is not available as a replacement part for all A/C compressors. If the A/C Compressor Regulator Valve -N280- is not available as an individual A/C compressor part (different versions), then the entire A/C compressor must be replaced if there is a complaint. Refer to the Parts Information.
A/C Compressor
- There are different versions. Refer to the Parts Information.
- Refrigerant Line, Disconnecting and Connecting. Refer to REFRIGERANT LINES, DISCONNECTING AND CONNECTING AT A/C COMPRESSOR .
- Removing and installing from the bracket. Refer to A/C COMPRESSOR, REMOVING AND INSTALLING ON BRACKET .
- Removing and Installing. Refer to A/C COMPRESSOR, REMOVING AND INSTALLING ON BRACKET .
  NOTE:
  There are different versions depending on the refrigerant (R134a or R1234yf). Refer to Parts Information.
Bolt
- Tightening specification for steel bolts: 25 Nm
- Tightening specification for aluminum bolts: 8 Nm +180°
- Only use aluminum bolts once, then replace.
- Quantity: 3
- There are different versions. Refer to the Parts Information.
Belt Pulley with Overload Protection
- There are different versions. Refer to the Parts Information.
- Overview. Refer to OVERVIEW - BELT PULLEY, MECHANICALLY DRIVEN A/C COMPRESSOR .
Alignment Sleeve
- Quantity: 2