Coolant light

Check the level in the reservoir. If it is low, add a 50/50 mix of water and the correct antifreeze. If it goes low again suspect a leak. Watch for a telltale puddle under the engine where you park.

Coolant is normally added if necessary during a routine oil change. The reservoir is not supposed to be filled. There will be a "min." And "max." On the side. The level should be between those two points when the engine is cold.