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 Engine Coolant Temperature indicator illuminate?

Go to Step 3

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

3

  1. Install a scan tool.
  2. Turn ON the ignition with the engine OFF.
  3. With the 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?

Go to Engine Overheating

Go to Step 4

4

Replace the instrument panel cluster (IPC). Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console.

Did you complete the repair?

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 2