2000 Cadillac DeVille Questions

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I don't even know where the waterpump is, thinking about changing that.
I CAHAGE OUT WATER PUMP, HEAD GASKETS, TEMPTURE SENOR, AND RADIATOR. BUT UDER HOOD IS NO SIGNS OF OVERHEATING.
My 2000 Northstar Cadillac Deville security light is on and three brand new starters have burned out since October, 2014. It starts and then it will not start again and the security light stays on.
This happens mainly on rainy days, then the next day everything is fine. What is going on?
I have got a misfire on cly.1 and 2 ive changed colis around and put new plugs and changed the map sensor the up stream o2 sensor put a different injector on 1 and 2 and put different boots on them and they still misf...
It want start but all lights come on
If all bolts can be removed and engine jacked up is it possible to change oil pan I have a cracked pan
I have taken this car to 2cadd dealers noHelp radio locked Service suspension system service AC Is there acomputer on board that may control all of these issues jayscalfri@comcast.net Daytona florida