Question about 1996 Cadillac DeVille

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I have had my water pump replaced on my 1996 Cadillac Deville and am still experiencing problems with the vehicle overheating and loosing large amounts of coolant. I have to add more coolant to the vehicle almost daily. The vehicle also tends to drastically overheat when going up hills and subsides when coming down hills. What may be the problem? Is it the radiator? a blown head gasket? the cooling fans not kicking on? or any other possible problems?

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I would take a strong look at a headgasket problem. providing there are no visible leaks of coolant. You would notice the fans coming on due to sound or a visual check when motor is hot. You can easily tell if a headgasket is bad by checking the spark plugs, If one or more usually side by side plugs are looking very clean or white compared to the remaining plugs that is a sign of coolant being burned off in that cylinder indicating a bad gasket. also check your oil for a possible milky tanish color,oil level over full, this indicates a bad head gasket also. not necessarily will both happen at same time but it is possible to have both symptons at the same time or one or the other.

Posted on Apr 05, 2011

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I have a 1998 Cadillac Deville with a northstar engine. I am having an issue with overheating and water not being taken into my radiator. I was told when i first bought it that it had a blown head gas


If you bought a car with head gasket issues
replace them,don't use it & ruin the engine

We can't guess at all the cars possible problems

People sell a car when they don't want the expense
of fixing it

The type problem is best left to a person that works on their
own vehicles & gets it cheap, knowing they have lots of
work to do every were ,to restore many things

Feb 08, 2013 | 1998 Cadillac DeVille

1 Answer

My 1996 cadillac deville overheats. i replaced the thermostat and water pump.. cooling fans do not turn on the only way to drive my car without it overheating is to turn on the a/c??? please help me


Hi Malik,
Thank you for choosing me to help you with your problem. In order to help you find out what to do with your Cadillac, I need to ask a few questions and get more information.
First, I need to ask you: When you turn the A/C on do BOTH cooling fans come on? If not, which one is coming on? The Left (driver's side) or the Right one?

Aug 09, 2011 | 1996 Cadillac DeVille

1 Answer

New water pump' thermostat,purge line. not heads or gaskets and still running hot


You say "Water pump thermostat" do you mean Thermostat or water pump? If you replaced the thermostat and still have an overheating problem then look at the water pump itself as the problem if that is replaced and you still have the problem then you have another problem in the engine or a clogged radiator core. You may have a lubrication problem in the motor, if the oil pump went out or your low on oil then the engine may be overheating from lack of lubrication. Another thing that will cause overheating is if the Fan is Electric and not activating or if the radiator fan is mechanical the clutch is not allowing the fan to rotate free when you are driving.

Feb 18, 2011 | 1996 Cadillac DeVille

1 Answer

My 96 cadillac is overheating. It idles fine. I get on the road and thats when it starts running hot. I replaced the water pump housing and hoses also the thermostat. Its losing a little coolant but dont...


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!

Nov 11, 2010 | 1996 Cadillac DeVille

1 Answer

2001 cadillac deville, overheats without loss of coolant


First, provided their are no visible coolant leaks and/or loss of coolant with no signs of leaks, I would thoroughly flush cooling system and replace coolant, then check and/or replace thermostat (you can place thermostat in boiling water to check for proper function), if you have tried these 2 steps and still are experiencing overheating you may need to replace your water pump which can be a tricky job if you're unfamiliar and try to do it yourself, however, I could walk you through it if necessary. Also visually check your radiator hoses for bulges, wear ,etc along with heater hoses etc. You may want to also check radiator fins to see if they are dirty/obstructed and clean if necessary. Let me know if I can assist you further and how it works out

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1 Answer

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96 Deville Overheating....TroubleShooting


did you run a compression check? if so and its good then you have a blockage in the water jacket
if not then you have a head gasket leaking

Feb 26, 2009 | 1996 Cadillac DeVille

2 Answers

I HAVE A 1999 DEVILLE


99 cadillac deville overheating put in new radiator,thermostat,waterpump. it stays cool at idle for a hour running.drivin about 15-30 minutes it overheats. is not using hardly any coolant to speak of.

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