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200Tdi bottom hose stays cold


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As title says, bottom hose and tank coolant stay ambient temperature - not even warm to touch after a run; top hose gets hot; temp guage shows normal.

Only work carried out recently is new cambelt kit and new coolant...

Has got a 2year old new rad and a <12month new viscous fan coupling.

Any thoughts? Normal?

Thermostat or water pump? Both?

Air lock?

Any "procedure" I can follow to isolate problem?

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200 and 300TDi engines are overcooled, so at this time of the year I wouldn't be surprised if the bottom hose was cold for an hour or so - especially if the vehicle is moving during that period. I know of these engines having no fan at all for most of the year as they are generally not needed (an electric fan conversion almost never comes on).


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Cheers Les!I'll keep an eye on it etc.

I just thought it was a but strange but I guess it makes sense as my rad is new and I keep it clear of any mud etc.

I just don't want to "hurt" it for the sake of a thermostat etc. :)

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  • 3 weeks later...

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