Question about 1999 Cadillac DeVille

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1999 cadillac starts but won't stay running just replaced headgasket and radiator and all was working. went to start it and it sounded like bad gas and now it turns over but won't run. the fuses look okay. now what

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nvannoy

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Check the compression
and remove some spark plugs and then crank if water comes out then there's your problem. If water is present remove plugs and crank for 10 -15 second intervals with one minute breaks to remove water.
Did you resurface the cylinder heads? If not (brace your self) you should redo the job and have the heads resurfaced.
As an alternative you could try some Blue Devil block sealer but it's definitely not a permanent fix.

If no water comes out and compression is good, check for spark and for fuel. You can check for spark by removing a plug wire, inserting a screwdriver (one with a thick rubber/plastic handle) and hold the metal part of the screwdriver about 1/2" away from some metal piece on the engine, when you crank the engine you should see a spark.
Check for fuel with a fuel pressure tester and put a test light on one of the injectors, it should blink momentarily.
By doing these things you will be directed to the next steps.

Posted on Jan 06, 2010

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1 Answer

I have a 1999 cadilliac , change radiator, cool system and therstat car still run hott


Headgasket blown or cracked head. You need to run a compression check on all cylinders. You can remove radiator cap and try to start. If the water is thrown out, you definitely have a headgasket/head problem.

Jan 21, 2014 | Cadillac Cars & Trucks

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Cadillac Overheats Northstar


This can be caused by a number of things most commonly failed headgaskets. You can use a cooling system pressure tester to pressurize the cooling system to see if it holds pressure if not then the headgaskets are likely leaking. You can also get a chemical tester to check for exahust gas in the coolant, if exhaust gas is present then replace the headgaskts. If both tests turn out fine first make sure your cooling fans are working if so remove your thermostat to see if engine stays cool, if so replace thermostat. If nothing works up to this point you may have a broken water pump or clogged radiator. You can use a laser temperature gun to check for hot/cold spots on the radiator if you find any replace. Otherwise remove the water pump to make sure the plastic impeller is not boke and still attatched to the shaft.

on Dec 21, 2009 | Cadillac Eldorado Cars & Trucks

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Cadillac Northstar Overheats


This can be caused by a number of things most commonly failed headgaskets. You can use a cooling system pressure tester to pressurize the cooling system to see if it holds pressure if not then the headgaskets are likely leaking. You can also get a chemical tester to check for exahust gas in the coolant, if exhaust gas is present then replace the headgaskts. If both tests turn out fine first make sure your cooling fans are working if so remove your thermostat to see if engine stays cool, if so replace thermostat. If nothing works up to this point you may have a broken water pump or clogged radiator. You can use a laser temperature gun to check for hot/cold spots on the radiator if you find any replace. Otherwise remove the water pump to make sure the plastic impeller is not boke and still attatched to the shaft.

on Dec 21, 2009 | Cadillac DeVille Cars & Trucks

1 Answer

I bought a thermostat from advance auto parts for my 1999 cadillac deville but I was told that it should only be bought from a cadillac dealership but I used it anyway. I put the thermostat on and the car...


Who did all this work?
Was the water pump bad?
Was the radiator, so clogged it could not be cleaned?

What diagnostics was done?

Is the car actually over heating? That is where you start

All that work may have been for not

When you removed the stat,the temp never went up,only the gauge,
can not run a veh without the stat, the temp sensor needs it in there

Is the exhaust converter partially blocked?
Is the engine running rich

Have the data looked at.

Nov 24, 2010 | 1999 Cadillac DeVille

2 Answers

I just purchased a 1999 Cadillac Deville. Drove fine for a few days. Today I drove 75 MPH for 20 miles on freeway and car began to overheat. Dashboard told me to replace oil. Checked the coolant, it took 1...


When a Cadillac (Northstar) overheats, It will give the message to change the oil. If you run a Northstar and keep running it long enough it will start shutting off cylinders and stop the A/C compressor to help protect itself. In this condition I would check for a blown headgasket. Possibly your technican will find the problem. Could also be stuck thermostat, dirty radiator Thanks

Aug 31, 2010 | 1999 Cadillac DeVille

1 Answer

Car is shooting water out of the radiator when i try to put water in it i changed my thermostat then problem started


If you are trying to put water in while the vehicle is running and is up to operating tempurature then yes you will get antifreeze gushing out. Also this year range of general motor vehicle's with the 3.8 engine are known for intake manifold's leaking antifreeze(usually into the combustion chamber) Most will confuse this with a bad headgasket. This is just FYI . Extra radiator gas/pressure/bubbles is a common symptom of a bad headgasket putting combustion pressure into the coolant system.

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1 Answer

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Sounds like you have a blown headgasket,check the coolant in the radiator and if you find oil in it you do need a headgasket.

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3 Answers

Keeps over heating, have changed the water pump, thermostat, and raideator


Is the cooling fan working? when does it overheat? you prob did but did you get all the air out of the engine? remove the coolant sensor on the intake and fill the system if in question. slick could be right too but you should diagnose it properly. quick check for combustion gases in cooling system is release the pressure in the radiator and replace the cap. start the engine, put it in gear and give it a little gas for about 10 seconds(this raises the cylinder pressure and increases the effect). put it back in park, leave it running and try to squeeze the top radiator hose- is it under alot of pressure? if so you could have a headgasket,cracked head or cracked block and should have it diagnosed professionally. tell the technition you would like a carbon-dioxide gas presence test done on the cooling system. if he looks at you like you are from mars-run because you are in a parts changers shop!!! you only want people to work on your car that are qualified and have the proper diagnostic equip.!!!!!!!!!
check to see if the cooling fan comes on with the a/c on- if it works. it should come on with the a/c running. you can request an answer from me if ya need/want more info. - good luck

Sep 05, 2008 | 1999 Cadillac DeVille

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