GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you perform the Engine Cooling Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Engine Cooling

2

Start the engine.

Does the high coolant temp indicator illuminate?

Go to Step 3

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

3

With a scan tool , observe the engine coolant temperature parameter in the powertrain control module (PCM) data list.

Does the scan tool indicate that the coolant temperature is within the temperature range shown on the temperature gauge on the instrument panel cluster?

Go to Engine Overheating

Go to Step 4

4

Replace the IPC. Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console.

Is the replacement complete?

Go to Step 5

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5

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3