How to Check Engine Coolant Level. Engine coolant is vital to your vehicle’s function. Not only does it keep your engine cool and protect it from overheating, which can cause a number of detrimental and costly problems, but also allows your engine to function at its optimal level. Here’s how to check your coolant level.
Allow the vehicle’s engine to completely cool before checking the engine coolant level. Engine coolant expands when it is heated, therefore the liquid will rise in the engine coolant reservoir, giving an inaccurate reading when the engine is warm.