My 1988 Cherokee 2.5L 5speed started overheating out of no where,it's been fine until now,when I seen antifreeze running off of my crankshaft the first thing I do is get a new water pump and thermostat,then find out they gave me the wrong pump,but before I go for another pump I put the new themostat on,crank it up and when it starts warming up I turn on the heater,but only cold air blows out and the only sign of a leak is small droplets going sideways towards the drivers side fender.and the radiator cold the engine starts to overheat again and when I cut the engine off it's like the heat from the motor transfers to the radiator,does anybody know whats going on with this? "Thanks in advance"