For 1990-2009 cars

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 Engine Coolant Level Indicator Module in Electrical. 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 | Go to Step5
4 | Repair the circuit. Refer to Engine Coolant Level Indicator Module in Electrical. Does the lamp stay on? | -- | -- | System OK
5 | Check for a faulty engine coolant thermostat stuck closed. Is the thermostat stuck closed? | -- | Go to Step 6 | --
6 | Replace the engine coolant thermostat. | -- | -- | System OK