A/C - Microfilter Introduction Dates
Group 64Heating and Air Conditioning
Bulletin Number
64 20 92 (3691)
Woodcliff Lake, NJ
December 1992
Product Engineering
SUBJECT:
Air Conditioning Microfilter Introductions
MODELS:
All Except E30
Situation:
Several inquiries have reached BMW regarding the introduction dates of the electrostatically charged micro filter.
All vehicles produced 9/91 or later (except the E30) are equipped 100% with the microfilter. In addition, all E31 vehicles have been equipped 100% with two microfilters since their start of production.
Vehicles with the microfilter are supposed to have a red "Maintenance Reminder" decal in the glove compartment. However, on vehicles produced during 9/91 - 5/92, many of the labels were inadvertently left off. These vehicles are, however, equipped with a microfilter. Refer to S.I. 64 12 92 (3632) for further information on the microfilter decal.
Some vehicles produced prior to 9/91 may be equipped with a microfilter, and can be positively identified by the presence of the "Maintenance Reminder" decal in the glove compartment.
The procedure for removal/installation of the microfilter element is contained in all current Repair Manual microfiche. For information concerning typical microfilter replacement intervals and filter capabilities, refer to S.I. 64 06 92 (3518).
Note:
This information supersedes all other information on microfilter introduction dates.