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Hi all me again, still running hot fitted new water pump,viscous fan,thermos and header tank top. Temp gauge at 12 o'clock but when i put heater control to low it goes up to end of the white line put heater back to 22 degrees or so and falls back to normal any ideas i thought it was fixed ?

Wammers that's what it was bad airlock thank f@~k. Thanks for the advice all.

Hi All new on here but hope i can get some advice. P38 2.5 dse as had 2 new radiators in the past 5 years problems when towing twin axle caravan. yesterday over heated again checked waterpump and impeller totaly in bits put new pump and thermostat in but now goes int red after a couple of miles...