Question about 1996 Cadillac DeVille

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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 see where.

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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!

Posted on Dec 27, 2010

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Posted on Jan 02, 2017

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Help ford ikon 1600 overheating after i replaced thermostat housing cleaned radiator replaced water pump replaced thermostat with another new one but still gauge moves to hot and fan comes on


check that you put the thermostat in the right way. The body of the unit has to be in the head / block water. Simple check is to start from cold and within 5-10 minutes idling you should start to feel hot water coming through the top radiator hose.. If in ok the bleed the air out of the cooling system by loosing off the highest hose and let the air out until you get solid water flow . Run the engine while doing this so that the water is circulated by the pump. Make sure that the heater core is open to allow the air in it to be removed

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Check first your coolant level. Start engine and turn on ac open hood see if cooling fans are running, if fans are running and coolant level is ok temperature should stay normal. If temperature rises squeeze coolant hose, it should be firm like you could feel pressure on the hose a sign that the water pump is good. Thermostat opens only when coolant reach normal operating temperature.

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I have a 1997 BMW 328i- Left it idling in the driveway for about 10 minutes, and it over heated, and started spewing rad. fluid out of overflow tank- let it cool down, took off up the road, and it...


yes, if the water pump is bad, input hose will be hot output hose will be cool, but that also could mean a bad thermostat.

a way to see if the water pump is pumping coolant is to remove the bleed screw on the thermostat housing and see if coolant spews out.

But it overheats. may as well change out the water pump and get rid of the original plastic impellers. While you're there, replace the thermostat with a 12 degree cooler one and drill 2 3/16" holes 180 degrees from each other in the thermostat.

2.8L motors are sensitive to overheating. you can bust a head gasket this way in no time. Also warp that long cylinder head.

Jul 13, 2010 | 1997 BMW 328

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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.

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Our 01 devill dts is overheating new radiaor,


That car holds 8 quarts of oil. Thats why its still low. You may have head gasket problems. Find a shop that is familiar with your Northstar engine, its going to be big bucks.

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97 Cadillac deville only overheats on hills it has a new radiator, water pump and rad cap. it runs fine on flat roads and at idle rad fans kick on about 222 degrees.


There's a few things I'd take into consideration. As stated in other posts, yes make sure transmission fluid is up to proper level. Also, depending on what engine you have, there may be an electric assist pump or even 2 in the system. On some, they have an electric pump to circulate coolant through heater core at idle to maintain proper heat , as well as another to assist mechanically driven pump when coolant temperature gets to approx 195F. Obviously when going up hills there is an added continuous load on engine, which will cause it to run hotter, thus I would expect that electric pump to be kicking in, and if not, may be the cause. Also the added load of climbing hills, creates added exhaust temperature, and if there is any restrictions, the results would be overheating. Quite often you may feel at least a little lack of power compared to what it used to be, or an increase in fuel consumption, or both when exhaust has a restriction. With that said, a weak water pump is also a possibility. Hope this sheds some light on what to pay attention to.

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Caddillac Deville keep running hot water keep coming back through the overflow tank


The thermostat could be bad. Run the engine cold with the cap off the bottle. If it comes out while the engine is still cold, you have a bad headgasket. Otherwise, start by replacing the thermostat.

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1 Answer

Engine is running hot on 1995 Cadillac Seville. Is it the thermostat or the water pump?


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.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 which leads to the thermostat housing,the blockage may be there.

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1 Answer

I opened my water pump housing on my 97 deville and the water pump looks fine and turns with key. i replaced a radiator and new thermostat just want some help before spending more money.


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(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 further back until you locate the blockage.

Oct 15, 2009 | 1997 Cadillac DeVille

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