Question about 1996 Cadillac DeVille

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1996 Cadillac Deville- running hot

The car runs hot but no hoses are even warm and the fans do not kick on but reads as if it is overheating

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What temperature readings do you get exactly?.

You can check if your fans are working by switching on the Air conditioning,the fans should be running all the time if the air con is on.

The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank,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.

Posted on Oct 04, 2009

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Replace your thermostat; the coolant is staying inside the engine and, the stuck closed thermostat won't allow coolant to enter the radiator like it should when the engine heats up.

Posted on Oct 03, 2009

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Is the water pump, belt and tensioner OK? its not where you think it is. its on the drivers side of the front cylinder head.

Posted on Oct 03, 2009

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Thermostat

Posted on Apr 16, 2013

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It may have overheated before it blew the hose.
If the engine temp sensor is reading that the engine is hot, the computer will disable the ac since it produces even more heat for the engine.
You would need to find out if the engine is in fact running hot and why.
It could be a sticking thermostat, or the water pump, or the radiator cooling fans or other causes.

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if its overheating, first check water level in radiator ( i assume youve done that).. next most likely, check thermostat located inside upper radiator hose where it mounts on front of motor... replace the thermostat ( a few bucks) being careful to reinstall the same direction as the original one... see if this corrects the over heating.

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Hello rileystephan

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your 1996 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, then you can even follow me on Twitter, for more great tips and tricks that will help you save a ton of money on car repairs. That one is at: twitter.com/acoates23234

Thanks for asking, and good luck!

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1998 cadilac deville running hot


when exactly does it run hot, does the cooling fan kick on at 225 Fahrenheit? does the AC radiator fan run?

Sep 17, 2010 | 1997 Cadillac DeVille

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turn the engine on, feel any water flow on either radiator hose, you can feel it, but abiously after it warms up thats when the thermostat opens, does it run rought at all??? lag of power, does it. check your fan clutch/electric fan. did you actually overheated the engine at all? the rason why is cause this engines have the habit of messing the headgaskets and over heat. that if worse gets to worse. let me know

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My 1996 cadillac deville is running hot. I installed a new water pump and the car still run hot...any suggestions?


did you check the thermostat? how about the fan is it working properly? and finally the radiator did you do a flow test on it?

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1 Answer

Engine overheating in 1999 Cadillac Deville. Cooling fan not coming on but does kick in when A/C is on. This is my Mom's car and I need help


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.

Also note that the cooling fans don't come on until the coolant temperature hits around 225 degrees.
During normal highway driving the fans will very rarely come on(if at all) due to constant air flow through the radiator.They will only usually come on in heavy traffic conditions on a hot day.
But......if you have the Air Con switched on, the fans will run all of the time.

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2 Answers

Why does my cadillac 1998 deville keep overheating?


Overheating can be numerous things: Fans not working, water pump, thermostat, overflow cap, and the list keeps going. When the engine is running and heats ups, feel the heat of the top hose, if the hose isn't hot, the thermostat is most likely stuck open and needs replaced. If it is hot we know you have circulation. The cap on the expansion tank may be defective, if it can't hold the pressure of the water, it will release at the overflow cap if the cap is bad. Also check the coolant level.

Jan 30, 2010 | 1997 Cadillac DeVille

2 Answers

I have changed the thermostat and radiator but the car continues to run hot. 96 cadillac deville


Make sure that the A/C condenser in front of the radiator is unobstructed and that the fans are operating correctly.
I'm assuming that you have had the car tested for hydrocarbons in the radiator and that there is no steam coming from the tailpipe and you have no leaks? (head gaskets)

Oct 07, 2009 | 1996 Cadillac DeVille

1 Answer

1990cad deville overheating


the first thing to check is to have the engine running. as soon as it reaches operating temp the upper radiator hose should get hot. if it doesn't then it's the thermostat. if it does then i believe your water pump is probably not circulating like it should and it should be replaced. however before replacing the wter pump make sure that the wire to sending unit is tight and not giving you a false reading. if your model has electric fans make sure the fans are running when the engine is hot. if they are not running check the relay in the fuse box for the fans with the engine running switch out the fan relay with the a/c clutch relay. ifthe fans kick on replay the relay with a new one. if they don't click on the it's either a bad wire or the temp sensor probe is bad. hope this answers your question. please rate this solution...thanks.

Aug 30, 2008 | 1990 Cadillac SeVille

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