S10/T10 Blazer 4WD V6-262 4.3L (1989)
Heater Control Valve: Customer Interest
A/C - Insufficient Cooling In Temperatures
Number:
91-42-1B
Section:
1B
Date:
August 1990
Corporate Bulletin No.: 061203
Subject:
INSUFFICIENT COOLING IN HIGH AMBIENT TEMPERATURE
Model and Year:
1988-90 S/T TRUCKS WITH AIR CONDITIONING C60
TO:
ALL CHEVROLET DEALERS
Some of the S/T model trucks from 1988 through 1990 with air conditioning 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.
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.