A/C - Reduced Performance

91buick09

Bulletin: 92-1-4

Date: Nov. '91

Ref. No.: 92-67-1

Corp. Ref. No.: 131213


SUBJECT: REDUCED AIR CONDITIONING PERFORMANCE (PERFORM DIAGNOSTICS - REPLACE LIQUID LINES)

MODELS AFFECTED: 1991 ROADMASTER ESTATE WAGONS 1992 ROADMASTER SEDANS


APPLICATION:

1991 Roadmaster Estate Wagons from VIN MW401829 to MW406551 and 1992 Roadmaster Sedans from VIN NR400911 to NR419101.

CONDITION:

Some vehicles built between the above listed VIN breakpoints may exhibit reduced A/C performance. This condition will be indicated by a 10 degree temperature increase at the center duct and a low side pressure that will not reach the 24 PSIG compressor cycle "off" point.

CAUSE:

The liquid line may be oversized at the location of the orifice tube, allowing refrigerant to "bypass" the orifice tube.

CORRECTION:

The technician should perform the "poor performance diagnostics" as outlined in the Service Manual. If the performance is not improved when following the guidelines, replace the Liquid Line.

WARRANTY INFORMATION:

Labor Operation Number: D3083
Labor Time: 1.0 Hours

NOTE: Time includes recover/recharge A/C system.