Why is my Rover 25 overheating?

My Rover 25 has started overheating. The water in the tank is bubbling up and there is a small amount of steam coming out. The engine fan is also continuously on. Any idea what the fault is?

Asked on 14 October 2016 by Nina c

Answered by Honest John
Reads like cylinder head gasket failure that is very common with the K Series engine. But if you're lucky might be no more than failed O ring gaskets between the head and the water heated inlet manifold.
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