If you are asking about the coolant level sensor, it is at the bottom of the coolant expansion tank. It is part of the tank so if it goes bad you have to change the whole tank. If you are having a problem with the tank reading low when it is full, the first thing to check is the type of antifreeze that you put in it. I had a water pump changed on my 2001 deville and they used green anti freeze and the sensor wouldnt read it.
SOURCE: 99 cadillac de ville
the coolant temp sensor is at the rear of the engine and is a "bad word" to get to. the 3 relays are at the bottom,under the fans. if you remove the driver side fan out of the way( 2 10mm bolts holding the fan) you should have good access to them. they do have locks on them and may be tricky to unplug. there is a 7/16 nut holding the relay plate down. remove and it should be easy to remove them.
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: Location of coolant temperature sensor
Maybe this will help . although this is from a 1997 Caddy.
Cadillac DeVille Engine Coolant Temperature (ECT) Sensor Location
SOURCE: 2003 cadillac cts coolant temperature sensor
I cant find a pic of the loctation.
It is under the intake in the back in the coolant bridge it is not bad
to change if you are not affaid to take the intakes off but to get to
it you have to take the intake off
SOURCE: 1994 cadillac deville concours
On my car, which is the same as yours, it is located on the manifold top back left. Pictures in the book just show it on top.
Get the
coolant pressure tested, its definitely leaking coolant. You will need to get
the coolant running line.
Pressure
test will help you to know from where exactly coolant/refrigerant is getting
leaked.
===========
For complete
step by step troubleshooting i suggest you to go through the help links
mentioned below :----
Click the
link below :-----
Coolant enters in transmission on Toyota Land cruiser?
http://schematicsdiagram.blogspot.com/2012/01/coolant-enters-in-transmission-on.html
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1991 Toyota
Camry: Order Coolant Bypass Tube?
http://whatisbyme.blogspot.in/2012/05/1991-toyota-camry-order-coolant-bypass.html
-------------
2002 Toyota
Camry: Puff of Blue or White Smoke while Starting?
http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html
----------------
1994 Toyota
Camry: Coolant Leak?
http://technoanswers.blogspot.in/2012/04/1994-toyota-camry-coolant-leak.html
----------
2006 Cadillac DTS: COOLANT LEAK AT DRIVER SIDE NEAR
FIREWALL?
http://schematicsdiagram.blogspot.in/2012/04/2006-cadillac-dts-coolant-leak-at.html
----------
MAF, IAT, MAP and Coolant Level Sensor problem all together
on Mazda MPV?
http://schematicsdiagram.blogspot.com/2011/12/maf-iat-map-and-coolant-level-sensor.html
---------------
GMC Engine Coolant Temperature (ECT) Sensor Replacing?
http://schematicsdiagram.blogspot.com/2011/12/gmc-engine-coolant-temperature-ect.html
------------
Loosing Coolant?
http://whoisbyme.blogspot.in/2012/06/loosing-coolant.html
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Coolant temperature sensor dies again and again?
http://schematicsdiagram.blogspot.com/2012/01/coolant-temperature-sensor-dies-again.html
------------
2000 Daewoo Lanos: Where to Add Coolant?
http://repairhelpcenter.blogspot.in/2012/06/2000-daewoo-lanos-where-to-add-coolant.html
Blue Water Warning Light on Dash?
http://whatisbyme.blogspot.in/2012/07/blue-water-warning-light-on-dash.html
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Replacing
Oldsmobile Engine coolant sensor?
--------------
How
to test Engine coolant temperature sensor?
------------------
Replace
Coolant Sensor Module on Oldsmobile?
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These details will help.
Thanks.
http://schematicsdiagram.blogspot.com/2012/01/coolant-temperature-sensor-dies-again.html
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Where to Add Coolant?
http://repairhelpcenter.blogspot.in/2012/06/2000-daewoo-lanos-where-to-add-coolant.html
-----------
------------
Blue Water Warning Light on
Dash?
http://whatisbyme.blogspot.in/2012/07/blue-water-warning-light-on-dash.html
--------------
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