Audi Workshop Service and Repair Manuals

HD = High-pressure end

ND = Low-pressure end

• Compressor
• ◆ O-ring seal for Zexel compressor):
  for low-pressure connection:
  17.2 mm/1.8 mm
  for high-pressure connection:
  14.0 mm/1.8 mm
• ◆ Tightening torque for Zexel compressor):
  low-pressure connection: 40 Nm
  high-pressure connection: 30 Nm
• ◆ Removing and installing refrigerant pipe on Nippondenso/Denso compressor
• ◆ Removing ribbed belt.

=> Relevant Workshop Manual Engine, Mechanical Components; Repair group 13

• ◆ Removing and installing compressor => Page 87-148
• ◆ After the installation of a new compressor or filling with fresh refrigerant oil (e.g. after blowing out the refrigerant circuit), turn the compressor 10 revolutions by hand before the first start to avoid damage to the compressor.

• Air conditioner magnetic clutch -N25
• ◆ Repairing.
  Zexel compressor => Page 87-41

• Oil drain plug
• ◆ In the Nippondenso/Denso compressor, a sealing ring is installed instead of an O-ring seal.
• ◆ Always renew
• ◆ O-ring seal for Zexel compressor:
  7.8 mm/1.9 mm
• ◆ Tightening torque:
  Zexel compressor: 10 Nm
• ◆ Tightening torque:
  Nippondenso/Denso compressor: 30 Nm
• ◆ May only be unscrewed to drain refrigerant oil if compressor is removed.
  Crank compressor with the magnetic clutch plate to accelerate extraction of refrigerant oil.

• Pressure relief valve
• ◆ O-ring seal
  8.8 mm/1.9 mm
• ◆ Tighten to 10 Nm
• ◆ Connection without valve May only be unscrewed if the refrigerant circuit is empty
• Connection with valve
• Air conditioner pressure switch -F129
• ◆ Function, removing and installing
• Condenser
• ◆ O-ring seal
  Inlet: 14.0 mm/1.8 mm
  Outlet: 10.8 mm/1.8 mm
• ◆ Depending upon the engine version, the refrigerant lines may have screw connections or block connections

• ◆ Tightening torque for screw connection
  Inlet: 30 Nm
  Outlet: 15 Nm
• ◆ Removing and installing refrigerant lines with block connection => Page 87-180

• Union in the refrigerant pipe
• ◆ O-ring seal
  10.8 mm/1.8 mm
• ◆ Tightening torque: 15 Nm
• Cap
• ◆ With seal
• ◆ Must be fitted
• Service connection
• ◆ High-pressure side
• ◆ For measuring, draining and filling with service station

• Restrictor
• ◆ In the screwed connection -8-
• ◆ O-ring seal
  7.5 mm/1.5 mm
• ◆ Replace restrictor with O- ring seal
• ◆ Removing and installing
• ◆ Apply a small amount of refrigerant oil to the O- ring seal before installing the restrictor
• Evaporator
• ◆ O-ring seal at air conditioner
  Inlet: 10.8 mm/1.8 mm
  Outlet: 17.2 mm/1.8 mm
• ◆ Tightening torque: 25 Nm
• ◆ O-ring seal at evaporator
  Inlet: 13.4 mm/2.4 mm
  Outlet: 13.4 mm/2.4 mm
• ◆ Tightening torque: 5 Nm
• ◆ Removing and installing refrigerant line => Page 87-179
• ◆ Removing and installing

• Service connection
• ◆ Low-pressure end
• Cap
• ◆ With seal
• ◆ Must be fitted
• Reservoir

Note:

The Audi RS4 currently uses reservoirs with block connections.

• ◆ O-ring seals:
• ‒ Design with screw connections
  Inlet: 17.2 mm; 1.8 mm
  Outlet: 17.2 mm; 1.8 mm
• ‒ Design with block connections => Page 87-181

• ◆ Tightening torque for refrigerant lines:
• ‒ Design with screw connections
  Inlet: 40 Nm
  Outlet: 40 Nm
• ‒ Design with block connections => Page 87-181
• ◆ Removing and installing:
• ‒ Design with screw connections => Page 87-144
• ‒ Design with block connections => Page 87-181