GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Check for a faulty low coolant sensor.

Is the sensor faulty?

--

Go to Step 2

Go to Step 3

2

Replace the sensor. Refer to Electrical Diagnosis.

Does the low coolant lamp continue to stay on?

--

Go to Step 3

System OK

3

Check for a faulty circuit.

Is the circuit faulty?

--

Go to Step 4

--

4

Repair the circuit. Refer to Electrical Diagnosis.

Does the lamp stay on?

--

--

System OK