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

WARNING: This page is about a different variant/trim than selected.

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 Line Feed-Through

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 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: Identifying Hose Clamps And Coolant Hoses

Courtesy of BMW OF NORTH AMERICA, INC.

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 Grounding 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 Earthing Cable Length

Courtesy of BMW OF NORTH AMERICA, INC.

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

Courtesy of BMW OF NORTH AMERICA, INC.

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: Removing Air Ducts From Heater/Air Conditioner

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!