Symptoms - Engine Cooling

Symptoms - Engine Cooling

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



Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) before using the Symptom Tables in order to verify that all of the following are true:

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. Refer to Checking Aftermarket Accessories (Component Tests and General Diagnostics) .
* 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. Refer to Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics) .


Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

* Cooling Fan Always On (Cooling Fan Always On)
* Cooling Fan Inoperative (Cooling Fan Inoperative)
* Coolant Heater Inoperative (Coolant Heater Inoperative)
* Loss of Coolant (LH2) (Loss of Coolant)Loss of Coolant (LC3) (Loss of Coolant)
* Thermostat Diagnosis (Component Tests and General Diagnostics)
* Engine Fails To Reach Normal Operating Temperature (Engine Fails To Reach Normal Operating Temperature)