Question about 1998 Cadillac DeVille

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1996 Cadillac Deville overheating. Bought a new coolant temp sensor. Need to know location of it. Thanks!

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Not sure of the location of it. Usually they are in the thermostat housing or on the top of the engine. Maybe on one side of a cylinder head. You may also replace the thermostat itself and make sure your cooling fans are working properly

Posted on Oct 02, 2010

Testimonial: "i found it and of course on the 4.6L its at the back of the engine underneath the EGR stuff making it a pain in the *** to get at and replace"

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Posted on Jan 02, 2017

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My Cadillac Deville, 2002 northstar is running hot........or the temp gage goes up and I have to stop driving..I have a new thermostat,relay switches for the fans,temp control sensor and a new coolant...


Check the fan to see if it is going on. On my 1997 Cadillac Deville Limousine I had to have the 2 fans, and 3 relays replaced, as well as the wiring contacts for the relays at an auto electric shop for about $700 last fall, but it has been running cool since then.

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Where is the ect(coolant) sensor located on a 02 cadillac deville???


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Car overheating after replacing the engine coolant temp sensor


Hello rok4zeroe and thank you for asking your question, on Fixya.

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your 1999 Cadillac DeVille, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people like you. So here is the link to:
How to diagnose an overheating Cadillac engine

Anyways if that helps you any little bit, then feel free to follow me on Twitter. That one is at: twitter.com/acoates23234

Thanks for the vote, and good luck!

Aug 27, 2010 | 1999 Cadillac DeVille

3 Answers

1996 Cadillac Sedan Deville that overheats only when idling


The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,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 close to the thermostat housing,the blockage may be there.

Jun 05, 2010 | 1996 Cadillac DeVille

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1998 cadillac deville fans not coming on starts


If your fans are not coming on then your engine is not receiving the signal that it is overheating. This can be caused by bad fans (unlikely they are both out) a bad relay, or coolant temperature sensor. I would start by checking or replacing the temperature sensor as it can become corroded which is what the PCM uses to turn the fans on. Many vehicles use two sensors, one for the gauge and the other for the ECU, make sure you check/replace the right one. It should be a cheaper part and if you are unsure then match the new one with its location; it should be on the intake manifold or near it, generally with one or two wires. I think you will find your problem as they are common failed parts.

Good luck!

Aug 30, 2009 | 1998 Cadillac DeVille

2 Answers

Location of coolant temp sensor


where can locate the engine coolant temperture sensor.

Jun 20, 2009 | 1998 Cadillac DeVille

1 Answer

I am trying to change coolant temp sensor


have you checked you fueses and relays?
the coolant sensor is located Under hood, driver side, rear engine area, mounted on intake manifold clearpixel.gif

Oct 27, 2008 | 1997 Cadillac DeVille

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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.

Oct 14, 2008 | 1994 Cadillac DeVille

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