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Why does the water in my Rover 25 keep getting low every time I drive it?

My water keeps going low every time I drive my Rover 25 and there's white stuff on the engine cap. What's the problem?

Asked on 31 January 2017 by Jenny james

Answered by Honest John
Standard K Series problem. Usually it starts at the 'O' ring gaskets between the head and the water heated inlet manifold, then the head gasket fails. See:
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