Hi, since recently my C70 makes slight howling noises from the area of timing belts, V-belts, one hears the noises best when the engine is running in the standing or in the first gear slowly passing a wall. The timing belt, V-belts and belt tensioners were changed at 112000km and now after about 2 years and 132000km further makes me the howling noises from this area, what could be the water pump or?? because that was then not changed. It is a C70 Bj. 2000 2,0T thanks!