I think I have a mouse in my transfer box! The noise is only there when there is no power on, downhill and coasting etc and not at all with diff lock on. Any ideas????

Hi all, Got a problem with my disco TD5. It started to overheat the other day and i had a blown top hose which i changed. The car got a bit hot a few times but i stopped and let it cool before going on. Since then i have noticed a real loss of power, especially going up hills. On Sunday, i...