A Symptoms - Engine Cooling

Important: The following steps must be completed before using the symptom tables.

1. Perform the A Diagnostic System Check before using the Symptom Tables in order to verify that all of the following are true:
^ There are no DTCs set.
^ The control module(s) can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to:
^ Hot Coolant Temperature Indicator Operation
^ Hot Coolant Temperature Indicator Circuit Description
^ Low Coolant Level Indicator Operation
^ Low Coolant Level Indicator Circuit Description

Visual/Physical Inspection
^ Inspect for aftermarket devices which could affect the operation of the Cooling System System. Refer to Checking Aftermarket Accessories in Diagrams/Diagnostic Aids.
^ Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
^ Inspect the cooling system for the proper coolant level.

Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent and Poor Connections in Diagrams/Diagnostic Aids.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
^ HOT COOLANT TEMP Message Always On
Hot Coolant Temp Message Always On

^ HOT COOLANT TEMP Message Inoperative
Hot Coolant Temp Message Inoperative

^ LOW COOLANT LEVEL Message Always On
Low Coolant Level Message Always On

^ LOW COOLANT LEVEL Message Inoperative
Low Coolant Level Message Inoperative