64 11 206 Removing and Installing/Renewing Heating Unit

64 11 206 Removing And Installing/renewing Heating Unit

Special tools required:







WARNING:
Danger of injury.
Refrigerant circuit is under high pressure.
Follow safety instructions for handling R 134a refrigerant.
Avoid contact with refrigerant and refrigerant fluid.
Follow safety instructions for handling refrigerant fluid.







IMPORTANT:
Risk of damage.
Restart engine only when A/C system has been correctly filled.
Follow instructions for opening and replacing parts in refrigerant circuit.
If air conditioning system is opened for more than 24 hours: Replace desiccant insert for A/C system







Necessary preliminary tasks:
- Drain off air conditioning system
- Remove support for dashboard
- Unclip wiring harness mounting from heater
- Remove fresh air duct
- Remove left partition wall for units compartment

N52, N62 only:
- Remove intake silencer housing
N63 only:
- Remove left intake silencer housing







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 screw (1) and remove refrigerant lines with lid (1) and associated seal.
Tightening torque 64 53 2AZ.
Installation

NOTE: Replace sealing rings.
Use special tool 00 9 030 to mount sealing rings without damaging them.







IMPORTANT:
Connections must not be mixed up.
Mark connection sequence of coolant hoses prior to removal.

Release hose clamps (1) with special tool 17 2 050 and detach coolant hoses.







Release nut (1) and nut (2) underneath.
Tightening torque 64 11 4AZ.







Release screws (1) and remove windscreen air duct (2).







Release screw (1).
Tightening torque 64 11 4AZ.







Release screw (1).
Tightening torque 64 11 4AZ.

IMPORTANT: Cover passenger compartment with protective cover to prevent interior being fouled by escaping coolant.

Feed out heater (2).







Replacement:
- Modify evaporator
- Modify heater core
- Modify expansion valve
- Modify all actuator drives







Installation note:
Water drain (1) must be inserted on both sides into water channel (2).

IMPORTANT: In the event of incorrect installation, there is a risk of leakage in the passenger compartment.







After installation:
- Evacuate and fill A/C system
- Fill and vent cooling system