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

Does the engine coolant temperature display operate properly?

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Go to Step 3

Go to Engine Coolant Temperature Gage Inaccurate or Inoperative

3

  1. Turn OFF the ignition.
  2. Turn ON the ignition, with the engine OFF.
  3. Observe the engine coolant temperature indicator on the instrument cluster (IPC) during the bulb check.

Does the engine coolant indicator illuminate during the bulb check and then turn OFF?

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

Go to Step 4

4

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

Did you complete the replacement?

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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 2