Hi All, my Dads Mazda Bongo is overheating after a few miles and he doesn't know what is causing the problem. I am 100 miles away from him so I can't check it out myself but I've asked him to check the fan comes on and that there is pressure in the coolant pipes but thats all I can say on the subject. He says it was overheating really quickly for a week then he took it for a run and the temp went up then he heard a strange noise and the temp went right back down to normal but the car bellows white smoke. I haven't seen this myself but it sounded to me like an airlock somewhere which cleared but this doesn't explain the white smoke. Its not loosing coolant and there is no water in the oil. Where can I point him to next? There are no decent garages where he lives so its hard to get someone to have a look.

The car is a 2.5 turbo diesel and if you are wondering what a bongo is look here... http://www.bongofury.co.uk/