Symptoms - Engine Cooling

Symptoms - Engine Cooling

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

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

1. There are no DTCs set.
2. The control modules can communicate via the serial data link.

Visual/Physical Inspection

* Inspect for aftermarket devices which could affect cooling system operation.
* 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 Always On
* Cooling Fan Inoperative
* Coolant Heater Inoperative
* Loss of Coolant (LC3) Loss of Coolant (LH2)
* Thermostat Diagnosis
* Engine Fails To Reach Normal Operating Temperature