Symptoms - Engine Cooling. GMC Truck Yukon XL

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2000 🢒 Yukon XL - 4WD 🢒 Body and Accessories 🢒 Data Link Communications 🢒 Symptoms - Engine Cooling

Important:

Perform the 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.

Review the system operation in order to familiarize yourself with the system functions. Refer to Instrument Cluster Indicator Operation and Instrument Cluster Description in Instrument Panel, Gauges and Console or Cooling System Description .

•	Inspect for aftermarket devices which could affect the operation of the Engine Cooling System electrical operation. Refer to Checking Aftermarket Accessories in Wiring Systems.

•	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 fluid level.

•	Inspect the cooling system for any leaks.

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

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

•	CHECK COOLANT TEMP Message Always On

•	ENGINE OVERHEATED Message Always On

•	LOW COOLANT Message Always On

•	LOW COOLANT Message Inoperative

•	Engine Overheating

•	Loss of Coolant

•	Engine Fails To Reach Normal Operating Temperature