ENGINE/TRANSMISSION COOLING SYS. MODIFIED ADD. COOLING

MODELS: 1979 - 1981 M.D. CONVENTIONALS WITH 427 - V8 AND MT640/650 AUTOMATIC TRANSMISSION EFFECTIVE WITH INTERIM 1981 PRODUCTION (VIN 1GDS7D4EXBV585818) THE COOLING SYSTEM OF THE ABOVE SUBJECT VEHICLES WAS MODIFIED TO PROVIDE ADDITIONAL ENGINE/TRANSMISSION COOLING CAPACITY FOR EXTREME MODES OF OPERATION (IE. STATIONARY PUMPING OPERATIONS, PROLONGED CONVERTER OPERATION, ETC.) THE SYSTEM MODIFICATIONS INCLUDE A GREATER FRONTAL AREA RADIATOR WITH A HIGH CAPACITY TRANSMISSION OIL COOLER AND A VISCOUS FAN DRIVE ASSEMBLY WITH AN INCREASED AIR FLOW FAN. PARTS INFORMATION * SEE 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.