64 11 206 Removing and Installing/Replacing Heating Unit
Risk of injury!
Refrigerant circuit is under high pressure!
Avoid contact with refrigerant and refrigerant oil.
Read and comply with safety regulations:
- Handling R134a refrigerant: see SAFETY INSTRUCTIONS and INSTRUCTIONS FOR HANDLING .
- Handling refrigerant oil: see safety instructions for HANDLING REFRIGERANT OIL (FOR REFRIGERANT R134A) .
- Instructions for working on cooling system: refer to INSTRUCTIONS FOR WORKING ON COOLING SYSTEM .
Risk of damage!
Restart engine only when A/C system has been correctly filled.
Necessary preliminary tasks:
- Draw off refrigerant from A/C system. Refer to DRAWING OFF, EVACUATING AND FILLING A/C SYSTEM (R134A) .
- Remove lower section of microfilter housing. Refer to REMOVING AND INSTALLING/REPLACING MICROFILTER HOUSING (LOWER SECTION) .
- Remove expansion valve. Refer to REMOVING AND INSTALLING OR REPLACING EXPANSION VALVE .
- Remove instrument panel trim. Refer to INSTRUMENT PANEL TRIM (Coupe) or INSTRUMENT PANEL TRIM (Convertible).
- Disconnect plug connection for control unit for Car Access System. Refer to CONTROL UNIT FOR CAR ACCESS SYSTEM (Coupe) or CONTROL UNIT FOR CAR ACCESS SYSTEM (Convertible).
E8x only:
Release screws (1).
Tightening torque 32 31 2AZ .
Secure steering column against falling out.
Unfasten screws (2).
Tightening torque 32 31 2AZ .
E8x only:
Lower complete steering column (1) until steering wheel rests on driver's seat.
Installation:
Check installation position of sleeve for steering spindle, correct if necessary.
Release cover cap (1) from bulkhead (2).
Release screw (1).
Tightening torque 64 11 1AZ .
Detach right footwell heating duct (1) in area (2) in direction of arrow.
Detach right footwell heating duct (1) with adapter (3) from heater/air conditioner and remove in direction of arrow from right rear compartment heating duct (4).
Detach left footwell heating duct (1) in area (2) in direction of arrow.
Detach left footwell heating duct (1) with adapter (3) from heater/air conditioner and remove in direction of arrow from left rear compartment heating duct (4).
Installation:
Make sure retainer (2) is correctly seated on left/right footwell heating duct (1).
Insert footwell heating duct (1) with adapter (3) in rear compartment heating duct (4).
Attach footwell heating duct (1) in area (4) to heater/air conditioner. Make sure assembly is locked exactly at point (5).
Unclip refrigerant lines (2).
Unscrew nuts (2).
Feed out media passage sealing plate (3) and associated rubber grommet.
Installation:
Makes sure media passage sealing plate and associated rubber grommet are correctly seated.
Carefully blow through aluminum double pipe to remove remaining coolant from heat exchanger for heating system.
Installation:
Vent cooling system and check for water leaks. Refer to CHECKING COOLING SYSTEM FOR WATER LEAKS .
Necessary preliminary tasks:
- Disconnect all necessary cable ties on support tube.
- Release wiring harnesses/cable ducts and lay to one side.
- If necessary, remove control units/disconnect plug connections.
Installation:
Make sure wiring harnesses/cable ducts are correctly routed and secured.
Release screw (1) of heater on support tube (2).
Tightening torque: 4Nm
Detach wiring harness (3) from support tube (2).
Release screws (1) of heater on support tube (2).
Tightening torque 64 11 6AZ .
Release nuts (1) on right on support tube (2).
Tightening torque: 21 Nm
Release nuts (1) on left on support tube (2).
Tightening torque: 21 Nm
Release screw (1) on support tube (2).
Tightening torque: 21 Nm
Release screws (1) on support tube (2) from bracket (3).
Tightening torque: 19 Nm
Detach support tube (2) and remove from vehicle with assistance of a second person.
Remove heater.
Installation:
Make sure heater (1) is correctly seated.
Installation:
Make sure condensate drain (1) is correctly seated in grommet (2).