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64 03 21_AIRFLOW RATE IN THE VEHICLE INTERIOR IS TOO LOW

SIB 64 03 21
AIRFLOW RATE IN THE VEHICLE INTERIOR IS TOO LOW

2021-07-09

This Service Information Bulletin (Revision 2) replaces SI B64 03 21 dated July 2021.
What’s New (Specific text highlighted):
Cause / Procedure sections – Borescope use added, LED/Flap operation correction

MODEL
E-Series
F97
F98
G01
G02
G20

Model Description
X3 M Sports Activity Vehicle
X4 M Sports Activity Coupe
X3 Sports Activity Vehicle
X4 Sports Activity Coupe
3 Series Sedan

Production Date
From Start of Production (SoP)

SITUATION
After replacing the microfilter during a previous service, the customer notices that the ventilation system
airflow rate is noticeably less. This leads to perceived lower cooling power.
The customer may also notice that external odors enter the vehicle.

CAUSE
The fresh air flap can be over-driven (pushed past its normal end stop) when the microfilter is replaced. The
regular opening and closing of the fresh air flap can no longer be guaranteed.
NOTE: To prevent this situation, when inserting the microfilter, it is essential to ensure that the air
recirculation function on the air conditioning control panel is activated (fresh air (the top flap of 3) is
in the closed position).

CORRECTION
Review the DCSnet Warranty Vehicle Inquiry and select the MP Claims (filter) button and/or the vehicle’s
history file to see if there was a recent prior microfilter replacement.
To rectify this concern, access the fresh air flap and determine if it can be returned to its normal position.

PROCEDURE
1. Activate the air recirculation function by
pressing the recirculation button on the climate
control panel (Recirculation mode, circled),
LED ON. This will close the top fresh air flap
leaving the bottom two recirculation flaps
open.
NOTE: It is the top flap which is in danger of
being damaged during microfilter service.

2. This can be confirmed in the Central
Information Display (CID) in the Climate

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Control Menu (MENU A/C) under AIR
QUALITY.
Ensure the flap is set to Air recirculation so the
top flap (fresh air inlet) sits flat and does not
interfere with microfilter removal.

3. Dismantle the microfilter
See REP 00 00 616 Service microfilter.

4. Remove the ventilation system blower motor.
See REP 64 11 213 Removing and
installing/replacing heater/air conditioner fan.

5. Check correct position of the fresh air flap
through the blower motor opening, or using a
borescope from the microfilter opening
(NOTE: This flap is the top of three flaps).
Activate and deactivate the fresh air/air
recirculation function on the air conditioning
control panel or CID menu and observe
whether the functionality of the flap is OK.
If the flap system is OK, the vehicle can be
reassembled.

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6. If the flap system is not OK, try to correct the
flap by hand. See direction of arrow.

7. Once moved back past the end point, the flap may not function properly.
After moving flap manually, use the test plan ABL to re-initialize/address the stepper motor position
Allow vehicle to enter sleep mode after running the test plan prior to testing flap positioning
If still not operational, then you may have to remove the stepper motor to check for damage. Once
repaired run the ABL to initialize the stepper motors and allow the vehicle to enter sleep mode before
testing.

PARTS INFORMATION
This repair should not require parts replacement. Parts replacement must only be done if the flap is
damaged.

WARRANTY INFORMATION
Covered under the terms of the BMW New Vehicle Limited Warranty for Passenger Cars and Light Trucks.
Defect Code:

6411007600

--Labor
Operation

---

00 00 006

Air conditioning housing/blower housing (incl. filter)
contaminated/obstructed
---

Description

Labor Allowance

Performing vehicle test (with vehicle diagnosis system –
checking faults) (Main work)

Refer to AIR

Performing vehicle test (with vehicle diagnosis system –
checking faults) (Plus work)

Refer to AIR

Support voltage of the vehicle electrical system / recharge
vehicle electrical system battery

Refer to AIR

Removing and installing/replacing heater/air conditioner
fan

Refer to AIR

Work time to dismantle the microfilter, correct the flap
position by hand and testing the flap position.

4 FRU

Performing vehicle diagnosis – test module (reinitialize/address stepper motor position)

1 FRU

Or:
00 00 556
And:
61 21 528
And:
64 11 710
And:
64 99 000
And:
61 00 006

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If you are using a Main labor code for another repair, use the Plus code labor operation 00 00 556 instead of
00 00 006.
Refer to AIR for the corresponding flat rate unit (FRU) allowances.
Stepper Motor and/or Other Repairs
If other eligible and covered work is performed as a result of performing the ISTA diagnostics and related
test plans, claim the consequential repair work with the defect code provided in this bulletin and/or the other
repairs with the applicable defect code and the labor operations listed in AIR (including diagnosis).
Based on which one applies to your center, please refer to SI B01 01 20 or B01 07 20 for claiming your
diagnosis work time, job/repair work time (WT), RO/Claim WT and/or repair explanation procedures, unless
otherwise required by State law.

QUESTIONS REGARDING THIS BULLETIN
Technical inquiries
Warranty inquiries
Parts inquiries

Submit feedback at the top of this bulletin
Please contact the Warranty department by either using the Live Chat that’s
available in the Warranty Documentation Portal or through IDS by selecting
Coverage, Policy, Coding Questions and Mileage Corrections
Submit an IDS ticket to the Parts Department

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