A/C - Compressor Bump Feel When Cycling

Group Ref.: HVAC

Bulletin No.: 331401

Date: December, 1993

SUBJECT:
A/C COMPRESSOR BUMP (REPLACE A/C COMPRESSOR PULLEY, ENGINE ACCESSORY BELT AND (BELT TENSIONER, 1993 VEHICLES ONLY))

MODELS:
1993-94 CHEVROLET CAMARO
1993-94 PONTIAC FIREBIRD WITH V-8 ENGINE
1994 VEHICLES WITH AUTOMATIC TRANSMISSION ONLY. BUILT PRIOR TO CHEVROLET VIN 146046 BUILT PRIOR TO PONTIAC VIN 218956

CONDITION:

Some customers may comment about an A/C compressor "bump" feel when compressor cycles.

CAUSE:

Engine power requirement changes when compressor cycles on and off.

CORRECTION:

1993 Vehicles:
An "L" size A/C compressor pulley (which has a larger diameter than the previous "G" pulley), a longer engine accessory belt, and a revised belt tensioner will improve A/C compressor "bump" feel.

1994 Vehicles:
An "L" size A/C compressor pulley, and a longer engine accessory belt will improve A/C compressor "bump" feel. The revised belt tensioner is not needed for 1994 repairs as it was implemented for all 1994 vehicles.

Replace compressor pulley per Service Manual Section 1D2. Procedure for drive belt and tensioner assembly can be found in Section 6A3A.

PARTS INFORMATION:





Parts are expected to be available from GMSPO by 11/29/93.

WARRANTY INFORMATION:

For vehicles repaired under warranty, use:

Labor Operation: D4280

Labor Time: Use Published Labor Operation Time.