BLOWER MOTOR WORKS ON THREE SPEEDS ONLY (NEW P/N RELEASED)

Subject: HEATER/AIR CONDITIONER APPEARS TO OPERATE ON ONLY THREE SPEEDS

Model and Year: 1992 M/L VANS

Some 1992 M/L van owners may comment that the fan lever on the heater control panel does not allow for a comfortable range of air flow settings. The selector lever was designed to allow for five comfort positions. Starting from the off position, the airflow is increased through four speeds by moving the lever to the right toward "HIGH".

Currently, the first two positions have only a slightly noticeable difference in air flow. When the lever is moved to the third position, the air flow increases dramatically.

If your diagnosis of the blower system (see the flow chart in section 1A-13 of the M/I Service Manual) indicates a malfunctioning blower speed switch, DO NOT replace the switch. The correction of this condition requires the redesign of the resistor. The redesigned resistor will not be available until approximately April 1992. When the correction is implemented, you will be informed via a Dealer Service Bulletin.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.