On older Cads with the Northstar engine the starter is in the intake manifold area. I don't know about a 2002 but I would assume its there also. It cranks the engine from above not below.
Easy as, 2 bolts at the front and 3 wires at the back remove all and it should come free, the motor is at the front of the tranny it is attached to the flywheel, disconnect battery first
Go t this page.
http://www.thepartsbin.com/automobile-starter-motor.html
SOURCE: 2002 Cadillac Coolant sensor
The engine coolant temperature sensor is located on the driver side of the engine near the rear of the engine compartment
SOURCE: Something is draining my battery on my 1998 Cadillac DeVille
I suspect parasitic draw. All vehicles draw some power from the batteries when the car is shut off. Certain accessories such as clocks, radios remote door openers and alarms always need power. The normal power used is called parasitic draw.
It is always a very low draw so it doesn't run the battery down. If you install accessories like shortwave radios or plug things like inverters and portable refrigerators into the accessory socket and operate them too long without the engine running you can drain your batteries to the point where the engine won't start. If there is an electrical short in the vehicle or a malfunctioning accessory it could be drawing much more than its normal load causing a drain on the batteries. If you leave your door open and the inside lights stay on all night you could drain the battery down till the car won't start.
Here's also a good resource for your car specifically on narrowing down the cause of the drain.
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