This vehicle was in a front end crash. We (my father of 92 years young and I are trying to R & R the heater core in this 1995 eldrado. Everything else was fixed even new paint! But it overheats, and the water does not circulate. We discovered the heater core was broken so I would like to know if someone could show me how the system works then I will be able to R & R the heater core, By the way we even added another little radiator with a fan to the vehicle for extra cooling! It is a 7.6 32 valuve north star engine.I wish I could see a diagram of the system!