Your Mazda3 Sedan & Hatchback's engine cylinder head gasket helps seal the engine block and cylinder head - sealing both the combustion chamber and the coolant passages in your engine. This gasket is exposed to both extremely hot high pressure combustion gasses and engine coolant! Symptoms of a blown engine cylinder head gasket includes: coolant leak from below the exhaust manifold, overheating engine, white smoke from the exhaust, bubbles in the radiator or coolant overflow tank, and significant loss of coolant.
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