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 1 452
64 1 453
64 1 454
64 1 455
64 1 456

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 side carpet on left.

Repeat repair only:

Remove sealing cap (1) from hole in A/C housing (2).

Installation:

Replace sealing cap.

Fig 1: Removing Sealing Cap From A/C Housing Hole

Courtesy of BMW OF NORTH AMERICA, INC.

First repair only:

CAUTION: To avoid swarf in A/C housing:
Drill holes at very low drilling speeds.
Carefully withdraw switched off drill together with swarf from holes.

Place drilling template 64 1 452 as illustrated on A/C housing (1) and predrill with 6 mm dia. drill bit.

Remove drilling template 64 1 452 and drill out hole with center bit 64 1 453 to 20 mm dia.

Installation:

Seal hole with sealing cap.

All:

Fig 2: Attaching Drilling Template On A/C Housing

Courtesy of BMW OF NORTH AMERICA, INC.

Attach guide for spray lance 64 1 454 as illustrated into hole in A/C housing (1).

Fig 3: Attaching Guide For Spray Lance

Courtesy of BMW OF NORTH AMERICA, INC.

Attach positioner for spray lance 64 1 455 as illustrated to guide for spray lance 64 1 454 and secure with knurled nut (1).

Fig 4: Attaching Positioner For Spray Lance

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 5: 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 6: 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 handover to the customer.