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coolant temp sensor


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can someone tell me where thhe coolant temperature sensor is located on a 97 Seville. The one for the ECM.

Also is there one or two?

reason why I ask about one or two is because many vehicles use 2 sensors, 1 sensor, and one sender for the gauge. but it seems there is only one on the northstar.

Thanks

GM FAN FOREVER

Nice, clean, luxury= fine automobile

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This is the description in the manual

Left hand rear corner of the engine, below the exhaust gas recirculation valve

Here is a gif file the ECT is #3

post-2998-131177012297_thumb.gif

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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looks like it is on the crossover housing possibly. Also is this the only one?

GM FAN FOREVER

Nice, clean, luxury= fine automobile

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Fisher may have posted the wrong picture.

The coolant sensor is screwed into the rear cylinder head, drivers side end, under the EGR and brake booster area. The coolant gauge gets its info from the PCM data. So there is only one temperture sensor.

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NO its NOT in the crossover its under the crossover in the rear head. That photo came DIRECTLY out of the GM SI manual and #3 is the ECT sensor

You will notice that NONE of the plugs are plugged in in the photo, so its exact location is not definate, its approximate, but it is a bad photo, Ill post another

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Its part of the rear wiring harness, in this photo its directly below the EGR, but again its only approximate, but there shouldnt be anything else in the area it should be clear, beside you know what a temp sensor looks like, it should shout out to you

Bank1Components.gif

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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it looks like its impossible to get to, look behind the throttle body down by the head and it sticks out. Theres all kinds of things above it that make it look impossible to get to but you can actually fish your hand down to it pretty easy and get an air wratchet on.

* 1966 Deville Convertible

* 2007 Escalade ESV Black on Black

* 1996 Fleetwood Brougham Black on Black V4P -Gone
* 1983 Coupe Deville Street/Show Lowrider -Gone

* 1970 Calais 4dr Hardtop GONE
* 2000 Deville DTS - Silver with Black Leather and SE grille GONE
* 1999 Seville STS - Pearl Red GONE

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well thats good because I actually know where to look now. I have to be honest though I am not comfortable using impact tools on the sensors though/ but it cant be any worse than usual

GM FAN FOREVER

Nice, clean, luxury= fine automobile

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th_IMG_0004.jpgth_IMG_0003.jpg

Here are a couple pics of my engine out of the car. Its a 99 but probably the same for the temp sensor. The left is showing the tranny for orientation and the right is close up. The green item in the center is the one.

Edited by airmike
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BBF as you can see I finally got the engine out of the car, in another 2 months I should be able to get it apart! Wow I should do this for a living as quick as I work:P. I hoped to at least help someone out since I am not getting much done.

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yes thank you very much, and that reminds me you should change that rear o2 sensor while the engine is out. B2 S1. Pita to get to with the engine in

GM FAN FOREVER

Nice, clean, luxury= fine automobile

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well thats good because I actually know where to look now. I have to be honest though I am not comfortable using impact tools on the sensors though/ but it cant be any worse than usual

didnt say impact, just the air wrench. If you can move a wracheting wrench enough then use one of them.

* 1966 Deville Convertible

* 2007 Escalade ESV Black on Black

* 1996 Fleetwood Brougham Black on Black V4P -Gone
* 1983 Coupe Deville Street/Show Lowrider -Gone

* 1970 Calais 4dr Hardtop GONE
* 2000 Deville DTS - Silver with Black Leather and SE grille GONE
* 1999 Seville STS - Pearl Red GONE

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th_IMG_0004.jpgth_IMG_0003.jpg

Here are a couple pics of my engine out of the car. Its a 99 but probably the same for the temp sensor. The left is showing the tranny for orientation and the right is close up. The green item in the center is the one.

off topic question to you or others. I seen at the junkyards yesterday someone removed the heads on a northstar and there in the valley between the heads I seen a starter :blink: Is that really where the starter is mounted? Under the intake? Crap thats an involved repair!

* 1966 Deville Convertible

* 2007 Escalade ESV Black on Black

* 1996 Fleetwood Brougham Black on Black V4P -Gone
* 1983 Coupe Deville Street/Show Lowrider -Gone

* 1970 Calais 4dr Hardtop GONE
* 2000 Deville DTS - Silver with Black Leather and SE grille GONE
* 1999 Seville STS - Pearl Red GONE

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Off topic question to you or others. I seen at the junkyards yesterday someone removed the heads on a northstar and there in the valley between the heads I seen a starter :blink: Is that really where the starter is mounted? Under the intake? Crap thats an involved repair!

Yep... the starter is under the intake..

Luckily it rarely ever fails.

Posted Image
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yes thank you very much, and that reminds me you should change that rear o2 sensor while the engine is out. B2 S1. Pita to get to with the engine in

i will change that o2 sensor, thanks for advice Mike

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Thia post was intended to go at the bottom of the thread, but somehow ended up in the middle. Sorry

Edited by JohnnyG

Never underestimate the amount of a persons greed.

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