For 1990-2009 cars

# CAMPAIGN: INOP. ENG. COOL. FAN A/C SYSTEM/ FAULTY C/F RELAYS

The cooling fan operation checking procedure, Part II of TECHNICAL PROCEDURE on pages 4 and 5 of subject recall campaign bulletin is incorrect. The following procedure must be used when checking fan operation:

PART II - COOLING FAN OPERATION SHOULD BE CHECKED AFTER INSTALLATION OF THE NEW RELAY USING THE FOLLOWING PROCEDURE:

1. Engine should be cool enough that engine cooling fan is not running. (Engine cooling fan will operate if the engine temperature switch senses coolant at or above 230 DEG F (110 DEG C).

*2. Ground under dash diagnostic connector by jumping TEST terminal B to GROUND terminal A.

3. Turn ignition switch to "ON" position only. DO NOT START ENGINE.

4. Operate the air control (upper) lever of the A/C control. Engine cooling fan should be operating when lever is in the A/C positions of MAX, NORM, or BI-LEVEL. (The engine cooling fan will also operate in the Defrost position on models that include the relay added for engine cooling fan operation in Bulletin 83-121A, Group 10-2A, dated August 1983.

*5. Remove ground specified in Step 2.

6. If engine cooling fan does not operate as outlined in Step 4 above, re-check for proper installation of cooling fan relay wiring outlined in PART I - REPLACEMENT OF COOLING FAN RELAY procedure.

7. If relay wiring is correct and engine cooling fan still does not operate, review the normal diagnostic procedures for cooling fan operation in appropriate service manual.

* Changes to the original procedure have been highlighted.

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.