A4 Mk2
|
| 1 - | Air conditioning system compressor regulating valve -N280- |
| q | Not to be removed |
| q | Checking actuation and operation → Chapter |
Note| The air conditioning system compressor regulating valve -N280- is actuated by the operating and display unit, Climatronic control unit -J255- and controls the pressure on the low-pressure end of the refrigerant circuit. |
| 2 - | Compressor |
| q | Detaching refrigerant pipe at compressor/attaching → Chapter |
| q | Replace O-rings at connections; for version refer to → Parts List |
| q | To protect compressor, engine is only to be started following complete assembly of refrigerant circuit |
| q | Detaching poly V-belt → Engine, mechanics; Rep. Gr.13 |
| q | Removing and installing compressor → Chapter |
| q | Different compressors depending on country version and engine → Chapter and → Parts List |
| q | On vehicles with 8-cyl. engine, the compressor is not driven via a belt, but rather by way of a shaft → Chapter |
| q | Following the installation of a new compressor or adding fresh refrigerant oil (e.g. after blowing out the refrigerant circuit), give the compressor 10 turns by hand after fitting and prior to initial start-up to prevent compressor damage |
| 3 - | Oil drain plug |
| q | “Denso” compressors are fitted with a sealing ring which is always to be replaced |
| q | Tightening torque: 30 Nm |
| q | Compressor must be removed before screwing out to drain off refrigerant oil. Crank compressor by way of pulley or drive unit to accelerate drainage of refrigerant oil → Air conditioner with refrigerant R134a |
| 4 - | Pulley/compressor drive unit |
| q | Replacing pulley → Chapter |
| q | Checking/replacing compressor drive unit → Chapter |
| 5 - | Pressure relief valve, 10 Nm |
| q | Not to be removed |
| 6 - | Connection with valve |
| 7 - | High-pressure sender -G65- |
| q | Removing and installing → Chapter |
| q | Checking signal → Chapter |
| 8 - | Condenser |
| q | Replace O-rings at connections; for version refer to → Parts List |
| q | Detaching and re-attaching refrigerant pipes → Chapter |
| q | Removing and installing condenser → Chapter |
| 9 - | Cap |
| q | With seal |
| q | Always to be screwed on |
| 10 - | Service connection |
| q | High-pressure end |
| q | For service station for measuring, draining and filling |
| 11 - | Screw connection in refrigerant pipe |
| q | Replace O-ring; for version refer to → Parts List |
| q | Tightening torque: 15 Nm |
| 12 - | Restrictor |
| q | Fitted in screw connection → Item |
| q | O-ring (7.5 mm/1.5 mm) → Parts List |
| q | Replace restrictor with O-ring; for version refer to → Parts List and → Air conditioner with refrigerant R134a |
| q | Removing and installing → Chapter |
| q | Lubricate O-ring slightly with refrigerant oil before fitting restrictor |
| 13 - | Evaporator |
| q | Replace O-rings at connections; for version refer to → Parts List |
| q | Tightening torque: Hexagon nut 25 Nm |
| q | Removing and installing refrigerant pipe → Chapter |
| q | Removing and installing → Chapter |
| 14 - | Service connection |
| q | Low-pressure end |
| 15 - | Cap |
| q | With seal |
| q | Always to be screwed on |
| 16 - | Reservoir |
| q | Replace O-rings at connections; for version refer to → Parts List |
| q | Tightening torque: Hexagon socket head bolt at block connection: 10 Nm for bolts with M6 thread and 25 Nm for bolts with M8 thread |
| q | Removing and installing → Chapter |