SNAPPING NOISE FROM ENGINE FAN REPLACE FAN BLADE ASSEMBLY

VEHICLES AFFECTED: 1982-84 S/T 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 engine 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 SIO/15 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 Assembly Spacer Clutch Engine/ Part Part Part Transmission Cooling Number Number Number Code Attach

1.9 L4 LRI 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 14046527 AAC D

2.OL L4 LQ2 Manual Without A/C 15530772 **3927793 B

Automatic Without A/C 15530772 **3927793 B

Manual With A/C 14066204 14076309 KB C

Automatic With A/C 14046528 14046527 AAC D

2.2 L4 LQ7 Manual Without A/C 15530772 **3927793 B

Manual With A/C 14066204 14066205 ADC C

2.8 V6 LR2 All Without A/C 14046528 22062564 SB D

All With A/C 14046528 14046527 CCR D

* 14033844 can be used optionally with 15538025 * * 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

Attch Qty Number Description Torque

A 4 11508967 Bolt-M8X1.25X85 20-30 N.m (27-40 ft.lbs.)

B 4 11508301 BoIt-M8X1.25X-78 20-30 N.m (27-40 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 14078823 Screw-M6X1.OX16 8-12 N.m (6-9 ft. lbs.)

D 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 11508164 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.