Water is coming in my 1996 Cadillac deville even after bypass heater core taking all the water from my radiator and coming inside my car some said drain but that wouldn't take water from a radiator right I'm in a bind please help 
The obvious question is where exactly is the water inside the car, and is it cooling system, rain or car wash water? You should be able to determine which it is by smell/taste. Cooling system water pretty much has to be coming from the heater rad and should be building up on the passenger side floor pan. If that's the case and you have temporarily bypassed the rad, the water leak should eventually stop as all the water leaks out.
SOURCE: 1992 Cadillac deville heater bypass
the easiest way to by-pass the heater core is to take off both hoses at the fire wall and use a piece of hard tubing to insert in both hoses and use hose clamps it's quick and easy and should get you by. make sure you top off the coolant and do this with engine cold.
SOURCE: no hot air from heater, blower runs fine
The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.
Since you state the 2 things you ruled out, that leaves only the water pump. Is the car running hot? The thermostat may be sticking as well... but im leaning toward the pump.
SOURCE: 96 Deville Overheating....TroubleShooting
did you run a compression check? if so and its good then you have a blockage in the water jacket
if not then you have a head gasket leaking
SOURCE: I HAVE A 1998 CADILLAC DEVILLE AND NEED TO REPLACE
Modification done by inserting generic T fitting into 3 way junction (Heater Core, Water pump, Surge tank) and using heater hose instead of pipe. Bye the way; the return pipe from the surge tank was not leaking so I did not bother to replace that pipe. I am watching the hose to make sure that pressurization swelling does not cause chaffing of the hose. The original replacement pipe was $80 and this modification is a fraction of that cost. The labor savings is significantly more important & valuable since this pipe requires the engine to be dropped (cradle installation) in order to remove and reroute the pipes from the firewall side of the Northstar V-8. There are two hard to reach attachments on the block that make it a maintenance nightmare. The resultant elevation of the hose to the surge tank and back does not inhibit surge tank functioning, at least not at this writing. I am keeping a close eye on everything. Experimental, but very doable fix.
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