Necessary preliminary tasks

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Remove REAR UNDERBODY PROTECTION
Remove HEATER/AIR CONDITIONER FAN

IMPORTANT: Use special tool 64 1 270 on right hand drive models.

Connect special tool 64 1 260 (spray lance) to spray gun (2).

Insert spray lance 64 1 260 through opening (1) into fresh air duct.

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

Fig 1: Moving Spray Lance Back And Forth

Courtesy of BMW OF NORTH AMERICA, INC.

Spray lance 64 1 260 shown on removed and cut-open heater/air conditioner:

Spray lance 64 1 260 in upper end position (1)
Spray lance 64 1 260 in lower end position (2)

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

Fig 2: Moving Spray Lance Back And Forth

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Set heating - A/C system to footwell ventilation and fresh-air mode. Open windows/doors.
Start car and run heating - A/C system at maximum fan power for approx. 5 minutes in order to dry evaporator.
In order to eliminate the last remnants of cleaning agent, repeat this procedure shortly before handover to the customer.