For 1990-2009 cars

Step | Action | Value | Yes | No
--- | --- | --- | --- | ---
1 | Check the coolant level. Is the coolant level below the add mark? | -- | Go to Step 2 | Go to Step 3
2 |

1. Add coolant as necessary. Refer to Cooling System Draining and Filling .
2. Perform a cooling system pressure test.

Is the repair complete?

--

System OK

--

3 | Check for a stuck open, missing, or wrong type of coolant thermostat. Is the thermostat operating properly? | -- | System OK | Go to Step 4
4 | Install the correct replacement thermostat. Is the repair complete? | -- | System OK | --