Symptoms - Engine Cooling

Symptoms - Engine Cooling

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

1. Perform the Diagnostic System Check - Vehicle before using the Symptom Tables in order to verify that all of the following are true: Initial Inspection and Diagnostic Overview
^ There are no DTC's 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 Cooling System Description and Operation.

Visual/Physical Inspection
^ Inspect for aftermarket devices which could affect the operation of the system.
^ Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
^ Cooling Fan Circuit Diagnosis (Single Fan) Cooling Fan Circuit Diagnosis (Dual Fans)Component Tests and General Diagnostics Component Tests and General Diagnostics
^ Engine Overheating Engine Overheating
^ Loss of Coolant Loss of Coolant
^ Thermostat Diagnosis Component Tests and General Diagnostics
^ Coolant Heater Inoperative Coolant Heater Inoperative
^ Engine Fails To Reach Normal Operating Temperature Engine Fails To Reach Normal Operating Temperature