64 11 206 Removing and installing/replacing heating and air-conditioning unit

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Special tools required:

WARNING: Danger of injury!
Refrigerant circuit is under high pressure!
Avoid contact with refrigerant and refrigerant oil.
Read and comply with safety instructions:

Handling R 134a (tetrafluorethane) refrigerant . See 64 50... NOTE FOR HANDLING R134A REFRIGERANT or 64 50... SAFETY INFORMATIONS FOR HANDLING TETRAFLUORETHANE REFRIGERANT R134A .
HANDLING REFRIGERANT OIL

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 AIR CONDITIONING SYSTEM .

Necessary preliminary tasks

Drain off AIR CONDITIONING SYSTEM
Remove SOUND INSULATION FROM BULKHEAD UPPER PART
Remove blower housing for heating and air-conditioning unit . See 64 11 545 REMOVING AND INSTALLING BLOWER HOUSING FOR HEATING AND AIR-CONDITIONING UNIT or 64 11 545 REMOVING AND INSTALLING FAN HOUSING FOR HEATER/AIR CONDITIONER (N52T, N55) .
Remove LEFT SUSPENSION CROSS-BRACE
Remove SUPPORT FOR DASHBOARD
Disconnect plug connections
Unclip wiring harness mountings from heating and air-conditioning unit

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.

Feed out line feed-through (1) towards top.

Fig 1: Identifying Feed Out Line Feed-Through Towards Top

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1) and remove refrigerant lines (2) with associated gasket.

Tightening torque 64 53 1AZ .

Installation note:

Replace sealing rings.

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

Fig 2: Identifying Refrigerant Lines And Screws

Courtesy of BMW OF NORTH AMERICA, INC.

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

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

Fig 3: Clamping Coolant Hoses Using Hose Clamps

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IMPORTANT: Carefully blow out coolant ports on the heat exchanger to remove the remaining coolant.
Close openings or line to heat exchanger with special tool 32 1 270 , to avoid media leak and dirt contamination.

Equipment specification with electric auxiliary heater only:

Release screw (1).

Remove grounding cable for electric auxiliary heater (2) from floor trim panel (3).

Fig 4: Identifying Electric Auxiliary Heater Earthing Cable, Floor Trim Panel And Screw

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Length of earthing cable (1) must lie between points 2 and 3 and should be 230 mm to 235 mm long.
Run excess cable as shown in item (4).

Fig 5: Identifying Length Of Earthing Cable

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Unlock retaining lug (1) on gaiter (2).

Lever gaiter (2) out of guides.

Installation note:

Make sure retaining lug (1) and adjacent guides are correctly latched.

Fig 6: Identifying Retaining Lug On Gaiter

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WARNING: Protect passenger compartment against emerging coolant.

Unclip air ducts (2), left and right towards bottom, from heater/air conditioner (1).

Feed out heating and air-conditioning unit (1) in direction of arrow.

Installation note:

Water drain (3) must be inserted on both sides into outlet channel (4).

Fig 7: Feeding Out Heating And Air-Conditioning Unit

Courtesy of BMW OF NORTH AMERICA, INC.

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

Replacement

Modify evaporator
Modify HEAT EXCHANGER
Modify EXPANSION VALVE
Modify ALL ACTUATOR DRIVES
Modify OZONE GENERATOR if necessary
Modify ELECTRIC AUXILIARY HEATER (FRONT) if necessary

After installation

EVACUATE AND FILL AIR CONDITIONING
Bleed and fill cooling system . See 17 00 039 VENTING AND FILLING COOLING SYSTEM WITH VACUUM FILLING UNIT or 17 00 039 BLEEDING COOLING SYSTEM AND CHECKING FOR WATERTIGHTNESS (N63 B44 O 0) .
IMPORTANT: Filling and bleeding must not be performed in ECO-PRO MODE!