Low coolant means that a vehicle is low on the fluid that flows through the engine system to prevent overheating. The coolant level can be checked by removing the lid on the coolant backup tank once the vehicle is cool.
On most vehicles, the backup reservoir is located towards the side of the car under the hood. After removing the lid, users should check to ensure the coolant is not below the minimum level mark on the reservoir. If the coolant is low, car owners should add coolant designed for their exact make and model of vehicle. Driving the vehicle with low coolant can cause extensive damage.