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

Special tools required: 

• 00 9 030
• 17 2 050
• 32 1 270

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 Feed Out Line Penetration

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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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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 Coolant Hoses And Hose Clamps

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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

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Run excess cable as shown in item (4).

Fig 5: Identifying Earthing Cable, Earthing Cable Points And Cable Item

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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 On Gaiter

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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 In Direction

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Replacement 

• Modify EVAPORATOR .
• Modify HEAT EXCHANGER .
• Modify EXPANSION VALVE .
• Modify ALL ACTUATOR DRIVES .
• Modifty 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)