Checking

1. Let the engine cool.
2. Turn the cap of the expansion tank slightly counterclockwise to allow any excess pressure to dissipate, and then open it.

3. The coolant level is correct if it lies between the minimum and maximum marks in the filler neck.

4. If the coolant is low, slowly add coolant up to the specified level; do not overfill.
5. Turn the cap until there is an audible click.
6. Have the cause of the coolant loss eliminated as soon as possible.