The thread on cap on the engine coolant reservoir is the pressure cap ( radiator cap )
Its in the front, under all that molded shroud ford designed.
It's on the coolant reservoir. Do not open when engine is hot.
Behind radiator Behind fan blades
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Yes, you should be able to do so although you may have to modify the radiator mountings or shroud. A "civilian" Crown Vic radiator has a smaller fluid capacity and probably a smaller power steering fluid heat sink, but for "normal" driving this should not be a problem. If the police Crown VIc is going to be placed into taxicab service, I would strongly recommend spending the money for the police package replacement radiator.
the 97 crown vic transmission is for the car and the interceptor is police car
If there, most times they break. Easier to just open the lower hose on the rad. side.