Heating and Air Conditioning: All Technical Service Bulletins
A/C - Solution to General Malfunctions
HEATING & AIR CONDITIONING
AC003-98
Title:
AIR CONDITIONER MALFUNCTIONS
Models:
'98 GS 300/400
September 4, 1998
Introduction
Some early production 1998 model year GS 300s and 400s may display one or more of the following conditions while driving with the Air Conditioner
ON:
^ Air Conditioner Magnetic Clutch will not engage.
^ Engine Coolant Temperature Gauge
does not function.
^ Automatic Transmission Indicator Lamp in combination meter doesn't function.
^ Outside Temperature Display indicates two centered bars illuminated (as shown in illustration) "freezes" or goes blank.
^ Blower motor inoperative
NOTE:
1. Normal A/C system operation is restored after the ignition switch is cycled once.
2. Condition may be Intermittent.
Affected Vehicles
^ 1998 model year GS 300s produced before VIN JT8BD68S*W0020000 and
1998 model year GS 400s produced before VIN JT8BH68X*WOOO74OO
Parts Information
Warranty Information
Production Change Information
Repair Procedure
1. If a 1998 model GS produced prior to the VIN indicated in the Production Change Information table exhibits any of the symptoms described,
replace the AC ECU with an improved one as indicated in the parts information table.
2. Additionally, check the part number of the ECM and replace if it is not a current production part as indicated in the parts information table.
NOTE:
ECM may have been replaced with current production part for SSC WL2. Always verity involvement/completion of SSC WL2 prior to proceeding
with ECM replacement. lithe vehicle is involved In SSC WL2, but does not show completion, follow SSC WL2 procedures for ECM replacement.