Quote:
Originally Posted by Airshac
There wouldn’t be a way for water to by pass circulating through the engine if the thermostat malfunctioned would there? I don’t think so. It is raw water cooled.
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If I understand the question correctly, that's exactly what the bypass does when the thermostat is closed, bypasses the engine and sends water directly to the manifold. Without testing (stove top pan test?) I wouldn't get fixated on a thermostat malfunction. For that matter, John Cookson's thoughts are equally viable, perhaps a gauge/sender/associated wiring problem. It needs to be checked.
Do you have an infrared temperature gun? It could provide a wealth of information. His question about a bypass valve is important too.
Another thought: are you sure it even has a thermostat? Have you removed the stat housing and had a look inside?