64 11 205 Removing and installing/replacing heating and air-conditioning unit (N54, N20)
Special tools required:
Follow INSTRUCTIONS FOR WORKING ON COOLING SYSTEM .
Risk of damage!
Restart engine only when air conditioning system has been correctly filled.
Follow instructions for OPENING AND REPLACING PARTS IN REFRIGERANT CIRCUIT .
If air conditioning is opened for more than 24 hours:
Replace DESICCANT INSERT for heating and air conditioning system. Read all notes regarding desiccant insert replacement on this vehicle.
Necessary preliminary tasks:
- Draw off REFRIGERANT FROM AIR CONDITIONING
- Remove SUPPORT FOR DASHBOARD
Recycling
Coolant emerges when coolant lines are detached. Have a suitable collecting vessel ready.
Catch and dispose of escaping coolant.
Observe country-specific waste disposal regulations.
Release hose clamps (1) and detach coolant hoses (2).
Release screws (3) and detach refrigerant lines (4) in direction of arrow.
Tightening torque 64 53 2AZ .
Installation note:
Replace sealing rings.
Use special tool 00 9 030 to mount sealing rings without damaging them.
Installation note:
Make sure bulkhead grommet is correctly seated.
Remove heating unit (1) in direction of arrow.
Installation note:
If necessary, replace gasket (2) and gaskets between heating unit (1) and bulkhead.
Make sure condensate drain grommet (3) is correctly seated in mount.
Make sure heating unit (1) is correctly seated in condensate drain grommet (3).
After installation:
- Evacuate and fill AIR CONDITIONING .
- Vent cooling system and check on watertightness. See VENTING WITH VACUUM FILLING UNIT and CHECKING FOR LEAKS .