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Typically this means that you need a new coolant tank, there is a coolant level sensor that is an integral part of it that goes bad.

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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Typically this means that you need a new coolant tank, there is a coolant level sensor that is an integral part of it that goes bad.

Is this a part a novice mechanic can replace or to the shop it go's, and would you happen to know how much the part may cost?

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Typically this means that you need a new coolant tank, there is a coolant level sensor that is an integral part of it that goes bad.

Is this a part a novice mechanic can replace or to the shop it go's, and would you happen to know how much the part may cost?

It is not too bad to do yourself, it just requires a little jockying around to get it out. There are two hose connections on the bottom if I recall, a couple of screws holding it, and electrical connector and a couple of hoses on the top

Before you change it, check the condition of the wiring at the bottom of the tank to make sure acid from the battery has not damaged the wires, mine were messed up and it looked like battery acid did it. And check the connector at the bottom, the wire and connector are for the level sensor. Don't forget to check the purge line when you refill the system to make sure it flows as a safety check.

It will cost you about $125 if I recall check www.rockauto.com and www.gmotors.com for prices

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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If you have the cable style hose clamp pliers the 2 hoses are easier to access but not absolutely necessary.

GM FAN FOREVER

Nice, clean, luxury= fine automobile

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I have to add this on here, I took the tank off my 99 sts and cleaned it thoroughly with a degreaser probably 5 rinses and it started working again. The price was right at least.

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I would pressure test the system for leaks, look at the water pump, and the rear of the intake,(drivers side) they leak. check your cap to see if it holds pressure.

let me know Ed.

He stated the system was NOT low on coolant, just the light on.

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I have to add this on here, I took the tank off my 99 sts and cleaned it thoroughly with a degreaser probably 5 rinses and it started working again. The price was right at least.

That will sometimes work. It's usually the cooling system supplement (sealant) tabs residue that gums up the level sensor.

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Actually, you CAN change the sensor (if you could find one), but not the switch. It's easier to just change the tank.

You know, I don't know why, but I have always had the belief that the coolant tank and coolant level sensor were integral and if the sensor went bad you needed to replace the tank.... Well I went to my service manual and found this statement : Transfer the coolant level sensor to the new surge tank

This is news to me, don't know where i got the wrong idea... oh well, live and learn.. Thanks Ranger for setting me straight

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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Don't feel bad Mike. I was under the same impression until just recently when someone on CF not only posted that it WAS replaceable, but posted a picture as well. I'm still learning as well.

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