Checking the coolant level in your BMW E90 is an important part of maintaining your vehicle. Coolant helps to keep your engine from overheating, so it’s important to make sure that you have the correct level of coolant in your car.
The coolant level should be checked when the engine is cold. To check the coolant level, open the hood of your car and locate the coolant reservoir. The coolant reservoir is usually made of translucent plastic and has a black cap. The coolant level should be between the “MIN” and “MAX” marks on the reservoir.