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

WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. However, it is still accessible from the selected car via links, so may be relevant.

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:

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
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 Out Line Feed-Through

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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

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

Fig 3: Identifying Coolant Hoses And Hose Clamps

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

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, Floor Trim Panel And Screw

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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 And Excess 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 Lock Retaining Lug And 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).

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

Fig 7: Removing Heating And Air-Conditioning Unit

Courtesy of BMW OF NORTH AMERICA, INC.