SERVICE MANUAL UPDATE SEC. 1A HEATER SYSTEM DIAGNOSIS CHART

Subject: HEATER SYSTEM DIAGNOSIS CHART CORRECTION

Model and Year: 1990-91 GEO TRACKER

This bulletin amends the "Heater and Ventilation Diagnosis" charts found in Heater System (Section 1A) of the 1990 and 1991 GEO Tracker Service Manuals (ST377-90 and ST377-91, respectively).

Figure 10 of this bulletin replaces Figure 12, on page 1A-8, of the 1990 GEO Tracker Service Manual (ST377-90). Figure 10 of this bulletin also replaces Figure 10, on page 1A-7 of the 1991 GEO Tracker Service Manual (ST377-91).

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.