• Smell of coolant when the engine is warm. The cause may be coolant leaking between the water outlet housing and intake manifold sealing surfaces (see Fig. 1). Refer to the Service Procedure to resolve this incident if it occurs. Note: A leak from the above-noted area can be verified by a visual inspection. Service Procedure:. This is a lot of Ford and Lincoln EcoBoost engines. A class-action lawsuit just filed says that the 1.5-liter, 1.6-liter, and 2.0-liter EcoBoost engines leak coolant into cylinders. It accuses Ford of selling cars with cracked heads, seals not sealing, and catastrophic engine failures.. The lawsuit alleges that the leaking of coolant into the cylinders causes corrosion,.