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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
Water is no longer forced into the engine/exhaust/cooling system once the pump is no longer rotating and engine is shut off. This means that you usually already have a problem and compression is either keeping it out or just not noticing the effect while running. The more common problems will be the head having a hole from corrosion allowing water into the cylinders or the manifold allowing water in due to a similar problem.
Thank you!- Joe
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