i need the water pipe layout of e36 328i

i put a e36 328i engine in a e30 body. the waterpipes get hard and hot. and the small pipe to the water bottle hardly pushes water. if i start an warm up the car an switch it off an leav it to get cold, when u open the water bottle lid, the water pushes out. the big top pipe from the head to the radiator hardly feels like ther in it.