A/C,HEAT MODE SELECTOR INOP. GEAR MECHANISM SLIPS

HEATER AND AIR CONDITIONING CONTROL ASM. GEAR MECHANISM SLIPS OUT OF ENGAGEMENT

VEHICLES AFFECTED: 1985-86 'B' CAR -----------------

The mode selector gear mechanism of vacuum rotary valve and slide rack may slip out of engagement on the above vehicles, causing mode selector to be inoperative.

This condition can be repaired by a new service package, P/N 1228343, without replacing the complete control assembly.

The new service package contains the following parts:

Slide Rack - 16040421 Rotary Valve Asm - 16042667

Procedure:

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1. Remove control assembly from I.P.

2. Replace slide rack and rotary valve making sure that the locating pin on rotary gear is aligned in the center of 'V' slot on slide rack.

3. Reinstall control assembly to I. P.

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.