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: HOW DO YOU CAHNGE THE THERMOSTAT ON 2002 CADILLAC DEVILLE
The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.
SOURCE: the diagram of a 2002 cadillac deville serpentine
Click on the following Link. It has the Serpentine Belt Diagram you will need.
http://www.2carpros.com/car_repair_information/year/2002/make/cadillac/model/deville/2002_cadillac_deville_drive_belt_routing_diagram.htm
SOURCE: cadillac deville all WIRING DIAGRAMS
Cannot post all wiring diagrams as it is too long to copy and paste.
Please be more specific.
SOURCE: I need an engine diagram for a 2002 Cadillac
your starter is under the intake manifold. Before replacing starter, recommend you read my post at http://www.fixya.com/cars/r5973094-starter_replace and let me know if you have questions.
Fig. 33: Vacuum circuits - 1984 V8 4.1L engine Calif. (DFI)
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hope this will help
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