GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Engine Cooling Schematics

1

Did you perform the Engine Cooling Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Engine Cooling

2

Turn ON the ignition, with the engine OFF.

Does the Low Coolant Warning Indicator illuminate?

Go to Step 3

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

3

  1. Turn OFF the ignition.
  2. Disconnect the Engine Coolant Level Indicator Module.
  3. Turn ON the ignition, with the engine OFF.

Does the Low Coolant Warning Indicator illuminate?

Go to Step 4

Go to Step 5

4

Test the Low Coolant Warning Indicator control circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 7

Go to Step 6

5

Replace the Engine Coolant Level Indicator Module. Refer to Coolant Level Module Replacement .

Did you complete the replacement?

Go to Step 7

--

6

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

Did you complete the repair?

Go to Step 7

--

7

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2