95 mustang leaking water pump changed the pump and its running backward now
Check the belt diagram and make sure that the belt is on correctly; if it is on backwards fix it. If you have white smoke coming out of the exhaust that is water vapor which means that the engine has gotten too hot and you have a cracked head or a blown head gasket.
you have your belt on the opposite side of the water pump pully just gotta switch it around
See diagram of belt routing on rad cover or hood. Like the others said. Depending on the engine, it may run backwards to the crank, look at the old one to see how it turns. It pulls water from the rad to the block, not the other way round. With the rad cap off and as the thermostat opens, water should flow from the upper hose into the bottom of the rad Edit: water gets sucked up lower rad hose into pump, pushed into engine up to thermostat that controls water temp and back into rad at the top. if it does not over heat and the belt is on correctly , don`t worry. I hope you did the thermostat when the system was drained
Belt is routed incorrectly. Do not feel bad as this is actually a common mistake. Another possibility is the Parts Store sold you the wrong pump. This engine (5.0 I assume) was availiable in multiple vehicles and the Mustang was the only one I know of that had some that turned backwards
