GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Is the LOW COOLANT level OK?

--

Go to Step 3

Go to Step 2

2

Fill the coolant reservoir to proper level.

Is the low coolant level indicator illuminated?

--

Go to Step 3

System OK

3

  1. Connect a scan tool.
  2. WOW the instrument cluster on.
  3. WOW the instrument cluster off.

Does the low coolant level indicator turn off?

--

Go to Step 4

Go to Step 8

4

  1. Disconnect the low coolant level indicator module connector.
  2. Turn the ignition switch to RUN.

Is the LOW COOLANT indicator on?

--

Go to Step 5

Go to Step 6

5

  1. Key off.
  2. Using a DMM, inspect terminal B circuit  68 (YEL/BLK) for a short to ground.

Is the specified value present?

Go to Step 6

Go to Step 7

6

  1. Replace the engine coolant level indicator module. Refer to Coolant Level Module Replacement in Engine Cooling .
  2. Inspect the system.

Is the repair complete?

--

System OK

--

7

  1. Repair the circuit 68 between the instrument cluster harness connector terminal B6 and the engine coolant level indicator module terminal B for a short to ground.
  2. Inspect the system.

Is the repair complete?

--

System OK

--

8

  1. Replace the instrument cluster. Refer to Instrument Cluster Replacement .
  2. Inspect the system.

Is the repair complete?

--

System OK

--