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99 cadillac deville with northstar motor randomly over heats and smokes from under the hood at separate times whats causing this

I have a 1999 cadillac deville with the northstar motor. Every once in awhile when i stop at a light white smoke comes out from both sides under the hood, whats the cause of this? Every once in awhile it overheats also but these things never happen at the same time? Ive replaced the thermostat and for awhile it stopped overheating and now its juts every once in awhile it overheats. Is the two problems linked? I also have a major leak from my power steering pump when i got it i was told it was the upper power steering line i replaced it and it steal leaks just as bad, what could it be?

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Posted on Jan 02, 2017

emissionwiz
  • 75197 Answers

SOURCE: My 1999 Cadillac Deville over-heats. I replaced

this problem is a leaking cylinder gasket(s)

Posted on Jun 26, 2009

  • 1114 Answers

SOURCE: power steering leak

To try to find the leak, purchase a spray can of engine cleaner and spray the entire area of the pump and hoses. Then wash off with a garden hose. Fill pump reservoir with fluid. Have someone turn the steering wheel while you look in that area of the pump and hoses with a flashlight for the leak. Be careful of rotating fan and belts!

Posted on Jul 23, 2009

militantbeas
  • 100 Answers

SOURCE: white smoke from under the hood of a 1999 cadillac deville with northstar what could it be

it sounds to me like the car is in need of a mojor flush and possible fan swith temp module. that could cause the radiator cap to over pressurize and shoot water out . can you give any more details? does it cool back off when you drive?

Posted on Oct 25, 2012

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1 Answer

White smoke from under the hood of a 1999 cadillac deville with northstar what could it be


it sounds to me like the car is in need of a mojor flush and possible fan swith temp module. that could cause the radiator cap to over pressurize and shoot water out . can you give any more details? does it cool back off when you drive?

Oct 25, 2012 | 1994 Cadillac DeVille

2 Answers

Temp got up to 230 on my 99 cadillac deville is that normal


Make sure your engine is breathing properly, by regularly changing air filters. Flush your cooling system once each year and pressure test. There are cooling lines that cross over the rear of the engine that get corroded and may begin to weep antifreeze..you can view these lines by removing the engine cover....if you've had a consistent odor of antifreeze after running,with no drippage evident, this area is probably the culprit.....love my 99...

Mar 14, 2012 | 1999 Cadillac DeVille

1 Answer

99 caddilac deville, clicking noise under hood when heater goes on, coolant smell,and heat blowing thru defrost only


sounds like a bad vacuum diaphram, used to switch coolant flow and/or airflow direction. this is best repaired by an expert, but can be done at home,with the proper tools and a manual specific to your vehicle.

Feb 15, 2011 | 1999 Cadillac DeVille

1 Answer

Removing starter from a1999 cadillac deville northstar


Northstar motors are complicated. The starter is inside the motor under the intake manifold.

May 13, 2010 | 1999 Cadillac DeVille

3 Answers

I have a 99 deville w/ 32valve north star engine and i have problems with it over heating i changed the water pump the radiator and thermostat i have no leaks but it still wont stopover heating


It is probably a head gasket issue if you have replaced the thermo and the pump and it still overheats. You probably can drive it 15 minutes or so and then the gauge starts soaring towards overheat shortly there after. Under completely normal driving conditions. Northstar engine's actually don't overheat not from bad head gaskets (they aren't the defect issue) but the inferior bolts holding the heads to the block. The bolts have been found to be pulling out of the Northstar's soft aluminum block(this is the actual problem but it's blamed on the gaskets). Causing spaces between the block, gaskets and the head that allows hot exhaust air to seep into the coolant flow chambers. This why your have coolant bubbling out of the top of the overflow valve under the hood after only short drives. Under normal operation the engine is literally boiling it's own water supply. The head bolt issue is a design flaw by GM and one that leads to a great number of Northstar engines being crippled at well under 100K miles of driving. Only remedy is to have both heads pulled off the engine, the head bolt replaced with new gasket and you're all set. Bad new very labor intensive whcih = a several thousand dollar repair. I had it happen to my 1998 Concourse Deville. I feel your pain.

Feb 18, 2010 | 1999 Cadillac DeVille

2 Answers

I want to buy a 99 cadillac deville and I was told it was only a head gasket problem (blown) what other items should I review before purchasing this vehicle. The owner claims she never let the car overheat...


poor choice if purchased. The head bolts tend to break and to have it repaired is very costly for they are slender and long. . A 99 Cadillac is too old for they have many modules operating this vehicle and the shocks themselves run nearly $1000 each. Back off on this deal

Feb 11, 2010 | 1999 Cadillac DeVille

1 Answer

I have a blow'n head gasket on my 99 Deville my question is would a 1999 northstar engine from a STS fit ?


It will work. You might have to change a few things but it will go in and hook up.

Apr 29, 2009 | 1999 Cadillac DeVille

1 Answer

Overheating,eveything looks ok.


I have a 97 Cadillac Deville with a northstar engine and have replaced it twice so far, so i answer this by experience...i've noticed to my two prior engines that went bad that the normal temp should NOT EXCEED 228 (normal), the red overheating light will come on at 250 and at 260 it will beep and tell you to stop engine - idle engine and will begin to smoke (overheat).

I hope this helps you and anyone else...by the way if your asking why did i replace my engine twice is simply because my cadillac is super clean inside and out, immaculate condition.

Apr 15, 2009 | 1997 Cadillac DeVille

3 Answers

99 cadillac deville


hello i have a 1998 cadillac deville course. an i been having the same over heating problems with mine i been taking it to mechanics an no one seems to know even the caddy dealship its overheating i checked the termostat water pump radiator all hoses was wondring could you tell me what you did or what you are doing to fix your problems my email is teree1234@yahoo.com thank you very much

Aug 02, 2008 | 1999 Cadillac DeVille

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