For you to even ask a question like this here tells me its best for you to bring it to a professional repair man. The water pump is requires removing many other parts to get to it, most recommend just having that done when you get your timing belt changed.
how do you replace the water pump on cadillac cts 2004 3.6
see answer given on how to change water pump on 92 deville. Same car.
How to replace the belt
No
How do you replace the water pump on a 1988 Cadillac Seville?
how do you replace the water pump on Cadillac cts 2004 3.6
change water pump
When you are having mechanical problems with your 2003 CTS Cadillac, you will know that your fuel pump is going out.
There is NO SUCH THING AS A CADILLAC CATERA FROM 2003...They stoped making them in 2001
Get manual from the parts store or from AUTOBOOKSONLINE.COM
How to change fuel pump in 1985 cadillac fleetwood
To change the water pump on an 1985 Cadillac Seville, first disconnect the battery and drain the coolant. Remove the serpentine belt, followed by the water pump pulley and any associated components obstructing access. Unscrew the water pump bolts, remove the old pump, clean the gasket surface, and install the new water pump with a new gasket. Finally, reassemble everything, refill the coolant, and reconnect the battery.