Special tools required:

WARNING: This page is about a different car, the 2003 BMW 525i, 2002 BMW 525i, and 2001 BMW 525i. However, it is still accessible from the selected car via links, so may be relevant.

64 1 451
64 1 456
64 1 457
64 1 458

WARNING: When handling cleaning agent, observe following protection measures:
Wear protective rubber gloves and protective goggles.
If cleaning agent comes into contact with eyes or skin, wash immediately with lots of water.

CAUTION: To avoid dirtying vehicle interior:

Close all air vents.
Switch air conditioner to recirculated air mode.
Cover carpet in work area.

Recycling:

Carry out the cleaning operation in a suitable washing bay as the emerging cleaning agent escapes through the drain openings in the transmission tunnel.

NOTE: Make sure the cleaning agent can escape freely from the drain openings. If necessary, remove rear underbody protection.
Remove limit switch for heater - A/C fan.

Seal off opening (A) of adapter for spray lance 64 1 457 with plug 64 1 458.

Clip adapter for spray lance 64 1 457 into opening of limit switch for heater - A/C fan.

Installation:

Make sure adapter for spray lance 64 1 457 is correctly seated in guides (1).

Fig 1: Removing Sealing From Spray Lance Adapter Opening

Courtesy of BMW OF NORTH AMERICA, INC.

Insert spray lance 64 1 451 in direction of arrow and secure with fixture for spray lance 64 1 456.

Fig 2: Inserting Spray Lance & Securing With Fixture

Courtesy of BMW OF NORTH AMERICA, INC.

Connect spray lance 64 1 451 to spray apparatus.

By moving spray lance 64 1 451 back and forth, spray a uniform amount of cleaning agent onto evaporator.

NOTE: After completing cleaning, allow car to drip-dry for approx. 5 minutes.

Fig 3: Connecting Spray Lance To Spray Apparatus

Courtesy of BMW OF NORTH AMERICA, INC.

Set heater - A/C to footwell ventilation and fresh air operation. Open windows/doors.

Start car and run heater - A/C at max. fan power for approx. 5 minutes in order to dry evaporator.

NOTE: In order to eliminate the last remnants of cleaning agent, repeat this procedure shortly before hand over to the customer.