Plug a diagnostic computer in to the EODB port and the device will display error codes on screen, you can then cross reference them to find out the areas to check.
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: 2003 cadillac deville want start
check battery voltage, if battery voltage is ok, you may need to check fuses under hood on passengers side, if start fuse is ok, you may need to have your starter replaced
SOURCE: Cost of battery for 2002 Cadillac Deville
USE ONLY A DELCO BATTERY, THEY ARE THE BEST, WITH INSTALL AND BATTERY ABOUT $150
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: I have a 1990 cadillac sedan deville with a E98 code
Sounds like the engine is idling to high. There is a procedure that you must go through to set it. Reply and I will let you know how to set it.
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