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Engine coolant temperature sensor

Tiny
RFOWLER04
  • MEMBER
  • 1996 CADILLAC DEVILLE
V8 front wheel drive automatic 144,000 miles.

My car starts running rough after driving it for long periods of time it does not really overheat just runs on the hot side around 228. Once I stop car and cools down runs fine. Have checked the fan does come on does not seem to come on like it should or blow as hard as it should and do not think it is the thermostat because it does not do it all the time. But when it starts running rough it idles really rough the rpm's go up and down and when you press the gas it does not want to go like it is choking. I was told to check the temperature sensor, but I donot know where it is located at or where to even find it.
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Friday, October 22nd, 2010 AT 4:38 PM

11 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,602 POSTS
Hello,

Engine coolant temperature (ECT) sensor left rear of engine, near base of rear engine lift hook. Here is a guide that will show you what you are in for when doing the job:

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement


https://www.2carpros.com/forum/automotive_pictures/12900_cts_50.jpg



Below is the location.

Please let us know what happens.

Cheers, Ken
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Friday, November 3rd, 2017 AT 6:17 PM
Tiny
DUKE915
  • MEMBER
  • 1 POST
  • 1996 CADILLAC DEVILLE
  • V8
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
V8 two wheel drive automatic 150,000 miles.

Where is the engine coolant temperature sensor located?
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Sunday, November 5th, 2017 AT 12:07 PM (Merged)
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
If you are talking about a Northstar, it is at the transmission end of the rear cylinder head, yellow and black wires leading to it. Visually, it is hard to see, if you see some grounds on a stud, it is slightly above that. If it is a 4.9l, it is in the thermostat housing.
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Sunday, November 5th, 2017 AT 12:07 PM (Merged)
Tiny
MDH84576
  • MEMBER
  • 1 POST
  • 1994 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 16,900 MILES
V8 front wheel drive automatic 169,000 miles.

I cannot find where it is located, I was told that it was near the thermostat. What do I have to remove to get to it?
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Sunday, November 5th, 2017 AT 12:07 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Top rear of engine.


https://www.2carpros.com/forum/automotive_pictures/12900_c_34.jpg

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Sunday, November 5th, 2017 AT 12:07 PM (Merged)
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
To add to that, If it is a Concours it has a Northstar. The temperature sensor is located in the rear bank cylinder head, just below the heater pipe nipple at the crossover. Same sensor as the others, yellow and black wires.
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Sunday, November 5th, 2017 AT 12:07 PM (Merged)
Tiny
DEAN1265
  • MEMBER
  • 2 POSTS
  • 1998 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 111,400 MILES
V8 front wheel drive automatic 111,400 miles.

I am trying to find the location of water temperature sensor.
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Sunday, November 5th, 2017 AT 12:07 PM (Merged)
Tiny
FACTORYJACK
  • MECHANIC
  • 4,159 POSTS
Rear back of cylinder head at transmission end. Look down to where the transmission shift linkage is, and at the rear of the cylinder head is a small wiring harness (in convoluted tubing) that branches. One branch goes to a ground stud and has an eyelet terminal on the end, the other branch goes to your engine coolant temperature sensor (black and yellow wires).
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Sunday, November 5th, 2017 AT 12:07 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
You are referring to the engine coolant temperature sensor, yours is located at right rear of engine, below the EGR valve.
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Sunday, November 5th, 2017 AT 12:07 PM (Merged)
Tiny
TIMOTHY PAINTER
  • MEMBER
  • 1 POST
  • 1999 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
  • 97,000 MILES
V8 front wheel drive automatic 97,000 miles.

I need to know were the coolant sensor is located.
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Sunday, November 5th, 2017 AT 12:07 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Description.


https://www.2carpros.com/forum/automotive_pictures/12900_c_17.jpg



In the left rear corner of the engine, below the exhaust gas re-circulation valve.
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Sunday, November 5th, 2017 AT 12:07 PM (Merged)

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