SNAPPING NOISE FROM ENGINE FAN REPLACE FAN BLADE ASSEMBLY

MODELS: 1982-84 S/T - ALL ENGINES

Some 1982-84 S/T trucks that were produced with the circular plastic fan blade assembly as shown in Figure No. 1 may experience a "snapping" or "cracking" type noise from the fan assembly during engine acceleration. If this conditon is encountered, the fan blade assembly must be replaced with the type shown in Figures No. 2, No. 3, and No. 4.

Use the following chart to determine which replacement parts are required. Fan replacement procedures are listed in section 6B of the S15 Light Duty Service Manual.

CAUTION:

Do not stand in line with any rotating fan assembly while the engine is in operation.

Do not use or repair a damaged fan assembly. An unbalanced fan may fly apart and cause personal injury and/or property damage. Replace any damaged fan assemblies with new assemblies.

1982, 1983, AND 1984 MODEL YEAR S/T TRUCK

FAN AND FAN DRIVE USAGE CHART FOR SERVICE APPLICATIONS

Fan Fan Engine/ Assemmbly Spacer Clutch Transmission Cooling Part Number Part Number Part Number Code Attachment ------------ ------- ----------- ----------- ----------- ---- ----------

1.9L L4 LR1

Manual Without A/C 15530772 * 15538025 A Automatic Without A/C 15530772 * 15538025 A

Manual With A/C 14066204 14076309 KB C Automatic With A/C 14046528 22008942 AAC D

2.0L L4 LQ2

Manual Without A/C 15530772 **15538024 B Automatic Without A/C 15530772 **15538024 B

Manual With A/C 14066204 14076309 KB C Automatic With A/C 14046528 22008942 AAC D

2.2L L4 LQ7

Manual Without A/C 15530772 **15538024 B Manual With A/C 14066204 14066205 ADC C

2.8L V6 LR2

All Without A/C 14046528 22008972 SB D All With A/C 14046528 22008928 CCR D

* 14033844 can be used optionally with 15538025

** 14001914 or 3927793 can be used optionally with 15538024

Note: Code (i.e. KB, AAC, etc.) is the printed letter code found on the clutch assembly body.

REQUIRED ATTACHING PARTS

Part Attachment Quantity Number Description Torque

A 4 11509222 Bolt - M8 X 1.25 X 85 20-30 N.m.(27-40 ft.lbs.)

B 4 11509162 Bolt - M8 X 1.25 X 78 2G-30 N.m.(27-40 ft.lbs.)

C 4 14046559 Stud - M8 X 1.25 X 33 18-24 N.m.(13-18 ft.lbs.) 4 11501889 Nut - M8 X 1.25 8-12 N.m.(6-9 ft.lbs.) 4 14001194 Screw - M6 X 1.0 X 16 8-12 N.m.(6-9 ft.lbs.)

D 4 14046559 Stud - M8 X 1.25 X 33 18-24 N.m.(13-18 ft.lbs.) 4 11501889 Nut - M8 X 1.25 8-12 N.m.(6-9 ft.lbs.) 4 14072796 Screw - M8 X 1.25 X 16 18-24 N.m.(13-18 ft.lbs.)

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.