I have been having a problem with my 2000 GT TDI 115PD. I have been losing a considerable amount of coolant. i.e coolant waring light coming on after a 100 mile journey or every week doing short journey's , The heaters are blowing a mixture of hot and clod air through and the water temperature gauge has a mind of its own ( Never goes past 90) I have had it into a garage and they can't find a leak and have also said that the water pump seems ok. Can anyone explain what is wrong?
Cheers