Check engine light came on and car would produce shaking and bumping feeling up on startup Took vehicle to AAA tire and auto Sylvania, Ohio. Service shop performed diagnostic. Used scope to visualize coolant in the third cylinder of the engine. Tech said that the cylinder was almost completely full of coolant and engine would fail soon and would need replaced. A few days later the car is now producing smoke from the exhaust and is now undrivable due to safety concerns from smoke and potential failure while driving.