Hello, my mate has got a 150 cdti on a 58 plate with 56k on and it overheats when driving within minutes, i have checked the water pump is turning, my questions are do the thermostats stick shut on cdti's and could the water pump shear off on the inside because the water is not circulating back in to the header tank, heaters blow red hot but water in header tank remains luke warm, any ideas, Thankyou.
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