When does the coolant warning light come on?
When does the coolant warning light come on? When the engine coolant is cold, the coolant level sensor triggers the warning light. As the coolant heats up with the engine, it expands raising the level. Check coolant levels when the engine is completely cold and top up if necessary. This is not applicable if the coolant warning light is blue. What does it mean when your coolant level is low? Keep in mind that a low coolant level means a leak is present which needs to be remedied at the earliest. Otherwise, your car will eventually be low on coolant...