BMW 7 Series: Removing And Installing/Replacing Heating And Air-Conditioning Unit

Notes

WARNING: Danger of injury! Refrigerant circuit is under high pressure! Avoid contact with refrigerant and refrigerant fluid.

Read and comply with safety information:

• Follow safety information for handling R 134a tetrafluorethane refrigerant.
• HANDLING REFRIGERANT FLUID

IMPORTANT: Risk of damage! Restart engine only when air conditioning system has been correctly filled.

If air conditioning system is opened for more than 24 hours: Replace DESICCANT INSERT FOR AIR CONDITIONING SYSTEM.

Necessary preliminary work:

• Drain off AIR CONDITIONING SYSTEM
• Remove ACOUSTIC INSULATION FROM BULKHEAD UPPER SECTION
• Remove BLOWER HOUSING FOR HEATING AND AIR-CONDITIONING UNIT
• Remove LEFT SUSPENSION CROSSBRACE
• Remove CARRIER 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 penetration (1) towards top.

Fig. 31: Identifying Feed Out Line Penetration

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

Tightening torque 64 53 1AZ.

Installation note:

Replace sealing rings.

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

Fig. 32: Identifying Refrigerant Lines And Screws

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. 33: Identifying Coolant Hoses And Hose Clamps

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

Fig. 34: Identifying Electric Auxiliary Heater Earthing Cable, Floor Trim Panel And Screw

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. 35: Identifying Earthing Cable Length And Run Excess Cable

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 engaged.

Fig. 36: Identifying Lock Retaining Lug On Gaiter

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. 37: Feeding Out Heating And Air-Conditioning Unit In Direction

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 A/C SYSTEM
• BLEED AND FILL COOLING SYSTEM

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