SNAPPING NOISE FROM ENGINE FAN REPLACE FAN BLADE ASSEMBLY

Model and Year: 1982-84 S/T TRUCKS - ALL ENGINES

Some 1982-1984 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 enqine acceleration. If this condition 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 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. Re- place 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/ Assembly Spacer Cluth Transmission Cooling P/N P/N P/N Code Attachmer ------------ ------- --- --- --- ---- --------- 1.9 L4 LR1 ---------- Manual Without A/C 15530772 *15538025 A Automatic Without A/C 15330772 *15538025 A Manual With A/C 14046204 14076309 KS C Automatic With A/C 14046528 22008942 AAC D

2.OL L4 LQ2 ------------- Manual Without A/C 15530772 **15538024 B Automatic Without A/C 15330772 **155380244 B Manual With A/C 14066204 14076309 KB C Automatic With A/C 14046528 22008942 AAC D

2.2 L4 LQ7 ---------- Manual Without A/C 15530772 **15538024 B Manual With A/C 14066204 14066205 ADC C

2.8 V6 LR2 ---------- All Without A/C 14046528 22008972 SS D All With A/C 14046528 22008928 CCR D

* 14033844 can be used optionally with 15538025 ** 14001914 or 3927793 can be used optionally with 15536024

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

REQUIRED ATTACHING PARTS

Attachment Quantity P/N Description Torque

A 4 11509222 Bolt-M8X1.25X85 20-30 N.m.(27-40 ft.lbs)

B 4 11509162 Bolt-M8X1.25X78 20-30 N.m.(27-46 ft.lbs)

C 4 14046559 Stud-M8X1.25X33 18-24 N.m.(13-18 ft.lbs) 4 11501889 Nut-M8X1.25 8-12 N.m.(6-9 ft.lbs.) 4 14001194 Screw-M6X1.0X16 8-12 N.m.(6-9 ft.lbs.)

D 4 14046559 Stud-M8X1.25X33 18-24 N.m.(13-18 ft.lbs.) 4 l1501889 Nut-M8X1.25 8-12 N.m. (6-9 ft.lbs.) 4 14072796 Screw-M8X1.25X16 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.