BMW 7 Series: Replacing Controller For Heating And A/C System Fan

Necessary preliminary tasks

• Remove FAN HOUSING FOR HEATER/AIR CONDITIONER

Unlock plug connections (1) and disconnect.

Release screws (3).

Remove controller (2) towards top.

Fig. 89: Identifying Controller, Plug Connections And Screws

REPLACING CONTROLLER FOR REAR AIR CONDITIONING BLOWER

Necessary preliminary work

• Clamp off NEGATIVE BATTERY CABLE
• Remove ALL LUGGAGE COMPARTMENT TRIM PANELS or from 11/2010, remove luggage compartment partition wall

NOTE: For purposes of clarity, picture shows component removed.

Release plug connections (1) and disconnect.

Unfasten screws (2).

Remove controller (3).

Fig. 90: Identifying Controller, Plug Connections And Screws

REPLACING EVAPORATOR TEMPERATURE SENSOR

Necessary preliminary work

• Remove trim panel for pedal assembly.

NOTE: For purposes of clarity, picture shows heating and air-conditioning unit removed.

Disconnect plug connection (1) from evaporator temperature sensor.

Pull evaporator temperature sensor with flat-nose pliers out of heating and air-conditioning unit housing (1).

Fig. 91: Identifying Plug Connection

REPLACING HEAT EXCHANGER

Necessary preliminary work

• Remove INSTRUMENT PANEL TRIM
• Remove LEFT/REAR SUSPENSION CROSS-BRACE.
• Remove BULKHEAD UPPER SECTION SOUND INSULATION

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.

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

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

Fig. 92: 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.

Release screws (1).

Installation note: Replace screws.

Remove cable guide holder (2) from the working area.

Fig. 93: Identifying Cable Guide Holder And Screws

NOTE: For purposes of clarity, picture shows heating and air-conditioning unit removed.

Unclip deflection arm (1) from angle positioning lever (2).

Installation note: Deflection arm (1) must snap audibly into place!

Fig. 94: Identifying Deflection Arm

Release screws (1).

Unlock and disconnect plug connections on upper distributor housing (2).

Remove upper distributor housing (2).

Installation note: Make sure filter housing guide lugs (3) are correctly seated in associated guide tabs on upper distributor housing (2).

Fig. 95: Identifying Upper Distributor Housing And Screws

Unclip pipe clamps (1).

IMPORTANT: Risk of contamination! Escaping coolant must not get into the passenger compartment.

Remove water pipes (2).

Remove heat exchanger in direction of arrow.

Installation note: Replace sealing rings.

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

Fig. 96: Removing Heat Exchanger And Water Pipes

After installation

BLEED AND FILL COOLING SYSTEM.

REPLACING HEAT EXCHANGER (HEATING UNIT REMOVED)

Notes

Unclip deflection arm (1) from angle positioning lever (2).

Installation: Deflection arm (1) must snap audibly into place!

Fig. 97: Identifying Deflection Arm

Release screws (1).

Unlock and disconnect plug connections on upper distributor housing (2).

Remove upper distributor housing (2).

Installation: Make sure filter housing guide lugs (3) are correctly seated in associated guide tabs on upper distributor housing (2).

Fig. 98: Identifying Upper Distributor Housing And Screws

Release screws (1).

Remove heat exchanger (2) in direction of arrow from filter housing (3).

Installation: Heat exchanger must be pushed correctly into designated guides on filter housing (3).

Fig. 99: Removing Heat Exchanger From Filter Housing

Replacement Open pipe clamps (1) with a suitable tool in direction of arrow.

Remove pipes (2).

Installation: Replace sealing rings.

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

Fig. 100: Opening Pipe Clamps

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