INOPERATIVE CRUISE CONTROL AND A/C -HEATER CONTROL HEAD

VEHICLES AFFECTED: 1988 BUICK REGAL

CONDITION: On early production vehicles, the cruise control servo and the HVAC control head may be inoperative due to a loss of supply vacuum to the vacuum tank.

CAUSE: The vacuum supply hose for the vacuum tank, located in the left front corner of the engine compartment, was routed as shown in Figure 1. The hose may be pinched or cut by the fender skirt, resulting in loss of vacuum.

REPAIR: Reroute the vacuum line through the trapezoidal hole in the bracket, as shown in Figure 2.

If the vacuum line is cut, replace the vacuum hose assembly using the following part numbers.

10063106 - With Cruise Control 10094192 - Without Cruise Control

Vehicles produced after VIN 1402730 have the vacuum hose routed as shown in Figure 2.

Use applicable labour time and number.

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.