ECC COMPRESSOR CUT-OUT RELAY- C-CARS WITH HEAVY DUTY COOLING

SUBJECT: ECC COMPRESSOR CUT-OUT RELAY ON DFI C-CARS

VEHICLES AFFECTED: Cadillac C-Cars With DFI

A compressor cut-out relay is being installed on Cadillac C-Cars that are ordered with optional heavy-duty cooling. This relay disengages the ECC compressor clutch (circuit #204) when activated by the transmission downshift switch (circuit #208). Vehicles with this relay will have an extra wiring loom along the right valve cover. The relay is taped to this loom near the rear of the engine compartment.

All DFI C-cars ordered with heavy-duty cooling built after approximate Broadcast Number 120000 have this relay. The service part number for the relay is 1618951. Refer to the attached circuit diagram for diagnosis.

NOTICE: The three connectors circled on the circuit diagram are identical and care should be taken to assure proper routing. ECM damage could result if improper connections are made.

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.