Squealing and overheating

Car squeals when turned on and when taking off, but not to much when driving. The water pump is ran off timing chain would this happen if pump has failed, would there be a leak since its internal? Will a leak at the end of a hose cause car to overheat. Car overheats after 8 miles or so, will cool down while accelerating but overheats when I Iet off the gas.