64 11 206 Removing and Installing/Renewing Heating Unit

64 11 206 Removing And Installing/Renewing Heating Unit







WARNING:
Danger of injury.
Refrigerant circuit is under high pressure.
Avoid contact with refrigerant and refrigerant fluid.
- Follow safety information for handling R134a (tetrafluorethane) refrigerant.
- Follow safety information for handling refrigerant fluid.
Follow notes for working on cooling system.







IMPORTANT:
Risk of damage.
Restart engine only when A/C system has been correctly filled.
Follow notes 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:
- Draw off refrigerant from A/C system
- Remove intake plenum
- Remove secondary air pump
- Remove lower section of steering shaft
- Remove right suspension cross-brace
- Remove expansion valve
- Remove instrument panel trim
- Remove complete steering column
- Remove air ducts
- Remove support for instrument panel







Release protective cap (1) on bulkhead and release screw underneath.
Tightening torque 64 11 1AZ.







Unclip refrigerant lines (1).
Unscrew nuts (2).
Feed out media passage sealing plate (3) and associated rubber grommet.

Installation note:
Makes sure media passage sealing plate and associated rubber grommet are correctly seated.

IMPORTANT:
Carefully blow through aluminium
double pipe to remove remaining coolant from heat exchanger for heating system.







IMPORTANT:
Protect working area (1) against escaping coolant.
Remove heater (2) with a second person helping from vehicle.







Installation note:
Make sure heater is correctly seated.
Make sure condensate drain (2) is correctly seated in grommet (1).







After installation:
- Vent cooling system and check on watertightness
- Evacuate and fill air conditioning system







Replacement:
Effective 09/2009, vehicles with SA 606 (Navigation Business) or SA 609 (Navigation Professional) will no longer have vent hose (1) on heater (2). In addition, vehicles manufactured up to 09/2009 will no longer require vent hose (1) for parts replacement.