Suburban 3/4 Ton 4WD V8-393 6.5L DSL Turbo (1993)
Refrigerant: All Technical Service Bulletins
A/C - Growl/Pumping Noise, Check Refrigerant Level
BULLETIN NUMBER: 93-1B-83
SECTION: 1B Air Conditioning
NUMBER: 12
CORPORATE
REFERENCE NUMBER: 361202
DATE: May 1993
SUBJECT:
GROWL NOISE DURING A/C OPERATION (CHECK FOR LEAKS/EVACUATE AND RECHARGE THE A/C SYSTEM)
MODELS:
1992-93 SUBURBAN WITH REAR A/C (RPO C69)
CONDITION
Owners of some 1992 and 1993 Suburbans with C69 (rear air conditioning) may comment on a noise (growl/pumping) during A/C operation (usually at
idle and above engine speeds).
CAUSE
Low charge due to leaks, improper initial charge, or system sensitivity to amount of charge.
CORRECTION
1.
Thoroughly check A/C system for refrigerant leaks.
2.
Repair any and all leaks found.
3.
Evacuate/purge the system of its refrigerant charge.
4.
Recharge the system with 4 1/2 lbs (72 oz.) of refrigerant (vehicle label says 4 1/4 lbs (68 oz.)
Important
Do not assume the vehicle has a full charge of 68 oz. and add 4 oz. Fully evacuate the system and recharge with 72 oz. of R12.
Specific instructions on evacuation and charge can be found in Section 1B of Light Duty Truck service manual X-9331 or X-9231.
WARRANTY INFORMATION
For vehicles repaired under warranty, use:
Labor Operation: T7631
Labor Time: 1.0 hr
Labor operation includes leak check, evacuation, and recharge. Consult the Labor time Guide for the appropriate labor operation if leak repairs were
necessary.