V 20 P/U 4WD V8-379 6.2L DSL (1988)
Technical Service Bulletin # 903181D
Date: 900801
A/C - Insufficient Performance
Number:
90-318-1D
Section:
1D
Date:
August 1990
Corp. Bulletin No.: 061202
Subject:
INSUFFICIENT COOLING IN HIGH AMBIENT TEMPERATURES
Model and Year:
1988-90 R/V TRUCKS WITH AIR CONDITIONING C60/C69
TO:
ALL CHEVROLET DEALERS
Some of the R/V model trucks from 1988 through 1990, either with or without rear A/C, may receive comments of insufficient cooling in high ambient
temperatures. To address this condition a water shut off valve which operates during Max A/C and an insulator cover for the accumulator may be added.
In addition, the refrigerant charge has been revised to increase air conditioning performance.
Service Procedures:
Water Valve Installation:
CAUTION:
Coolant may be pressurized and hot. Use care to ensure that the coolant is at ambient temperature. Possible burns could result from
contact with hot coolant.
1.
Drain the coolant.