ROUGH/LOW IDLE OR W/S FOGGING A/C FAN RELAY

Models Affected: 1982 and 1983 Century, Skylark, and Skyhawk Models

"Please discard previous bulletin 83-121A Section 1 issued 8/83 due to change in part numbers and diagram. "

Low engine idle can be caused by high A/C compressor loads due to high head pressures resulting from compressor operation without engine cooling fan operation while in defrost mode.

This condition can be corrected by installing an additional engine cooling fan relay, Part Number 14078902 for Century and Skylark models or 14073422 for Skyhawk models, (see diagram) to operate the engine cooling fan in defrost mode.

The relay should be installed on the cowl, adjacent to the pressure cycling switch. Any wiring run through the cowl should be routed through existing grommets and care should be taken to maintain cowl sealing.

Materials Required

Quantity Part Number Description

1 14078902 for A & X or Cooling fan relay 14073422 for J

1 12010015 Comector body

4 8905087 Comector terminals

Warranty Information

Labor Operation T3098 Labor Time .4Hr Trouble Code 92

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.