Hello jayv.
There are 2 in the 2002 Deville.
This one in the diagram below under the hood.
And this one under the rear seat on the right side.
Amazing where they put things on cars now.
You will also find the battery under the rear seat. It may be a good time to check the terminals for corrosion while you are checking the fuses.
If you need further help with this, please ask me here, be glad to help.
Thank you for using FixYa.
Kl
How to remove the rear seat
I have a 02 Cadillac devil I just bought a new starter, raditor and a new battery my car won't start at all..
You may need a sensor,there are many,so get a diagnostic check first.
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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: 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: the service stability system light came on in my
My Service Stability System Message along with the (ABS) Brake Light lit up on my dash, what can i do to fix it...Or what does this mean ?
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