GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Engine Cooling Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check

2

Start the engine.

Does the CHECK COOLANT TEMP message illuminate?

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Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3

With a scan tool select instrument panel cluster, and command the CHECK COOLANT TEMP message ON and OFF.

Does the CHECK COOLANT TEMP message turn ON and OFF when commanded?

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Go to Engine Overheating

Go to Step 4

4

Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges and Console.

Is the replacement complete?

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Go to Step 5

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5

Operate the system in order to verify the repair.

Did you correct the condition?

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System OK

Go to Step 3