For 1990-2009 cars

# DIESEL CRUISE MASTER SYSTEM HI ENGAGE INFORMATION

AUTOMOTIVE DIESEL ENGINES ARE EQUIPPED WITH A VACUUM PUMP AND REGULATOR TO SUPPLY VACUUM FOR THE CRUISE MASTER CRUISE SYSTEM. IF THE REGULATOR IS MISSING OR IS SUPPLYING MORE VACUUM THAN SPECIFIED (GREATER THAN 7 IN. HG), A SPEED SETTING 5-10 MILES PER HOUR HIGHER THAN DESIRED WILL OCCUR WHEN THE CRUISE ENGAGEMENT SWITCH IS DEPRESSED. IT IS, THEREFORE, IMPORTANT THAT THE REGULATOR IS INSTALLED AND FUNCTIONING PROPERLY. A TYPICAL INSTALLATION OF THE REGULATOR AND CRUISE TRANSDUCER IS SHOWN IN FIGURE 1.

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.