The water pump is the heart of the cooling system. Even though it is uncommon, it is also attainable to mis-route a serpentine belt on particular vehicles. Such a mistake can trigger the water pump to rotate backwards and overheat the engine. Ideal is to always refer to the routing diagram when replacing a serpentine belt. Thank you for asking about your car. Do you happen to know what caused the radiator to start leaking? Was the cooling technique creating up a lot of pressure? You mentioned the vehicle was operating rough, also. Have you noticed any troubles with engine power? Please speak to our technical assistance line so that we can get a small better understanding of the vehicle's situation and be able to make any proper suggestions.