Question about Cadillac DeVille

1 Answer

Just bought car 94 deville 4.6 northstar 58k miles ..high temp engine coolant ...engine hot ...then engine shuts down water pump & thermostat,sensors was replaced by previous owner..i checked the water..but checked the coolant some kind of oil not sure if it is tranny oil? looks kind of pink but maybe its similar color of coolant ..but definately milky..any ideas ? thanks for the help

Posted by Tommy on

  • 3 more comments 
  • Tommy Aug 15, 2008

    i dont thinks its motor oil ...i really thinks its transmission oil..there is no signs of oil on the dip stick at all ..i am leaning towards the radiator is poss cracked ..and has clogged up the radiator and there probably no circulation ???

  • chanfunk Aug 20, 2008

    100k miles, had same warnings after sitting and waiting on long train with air on, then the radiator-empty plug blew out and stripped the threads. Don't know why it overheated. Shop wants to replace radiator, hoses, clamps, thermo to tune of $700. Suspect this is just start of our problems...considering walikng away from this car.

  • ehc155a Oct 31, 2008

    se calienta, se le cambioi el telmostato, pienso cambiarla las mangas

  • Anonymous Mar 16, 2014

    why does my 199 northstar deville say "AC HOT/shut engine off"?

  • Anonymous Mar 25, 2014

    car shakes engine light on milky color in engine



1 Answer

Ronnie Houston

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert who has answered 1,000 questions.

  • Master
  • 2,920 Answers

I would say possible head gasket seeping into radiator...

Posted on Aug 15, 2008

  • Ronnie Houston Aug 15, 2008

    if there were a crak in the radiator you would know....check the transmission coolant lines to be sure but ytans fluid would not clog the radiator nor make the car run hot



Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

3 Answers

Temp goes up and down

get the water pump checked and the radiator.

Sep 01, 2008 | 1997 Cadillac DeVille

2 Answers

I have a Cdillac Deville 98 northstar. Getting an Error message - Engine overjeat, Change Engine oil, Check Coolant level and later I get Idle engine message I changed engine oil and coolant recently -1500...

Whatever you do, NEVER allow this engine to overheat and always use the correct antifreeze (DEX COOL) or you will damage your heads severly. The heads were made from aluminum so there is a very serious warping issue on the 1998 Cadillac Northstar engines. There should have been a recall but wasnt, ended up costing me 3 thousand USD to fix the engine problems I had but she now runs fine. I only had the car 4 months before this happened so someone prior to me owning evidentaly let it overheat on too many occassions and I had no choice but to fix cause I was still paying on the car!! Good luck

Jul 12, 2010 | 1998 Cadillac DeVille

4 Answers

1998 Cadillac Deville overheating . Engine overheats to 245 + degrees when running 50 mph or more with some torque load.( ie.hills and 4 passengers) New thermostat and coolant reserve pressure valve.were...

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 to near the thermostat housing,the blockage may be there.

Mar 15, 2010 | 1998 Cadillac DeVille

4 Answers

I have changed the radiator and thermostat and water pump and it keeps running hot


Nov 12, 2009 | 1998 Cadillac DeVille

2 Answers

No heat on my 98 caddy deville delegance?

do the heater core coolant supply hoses both get hot at the firewall in the engine compartment? if yes then you have a defective temperature control blend door actuater motor.

Oct 17, 2009 | 1998 Cadillac DeVille

2 Answers

What coolant temp should i have, while driving temp gets to 222 f. is this normal?

222 is quite normal for the Northstar engine.
The cooling fans don't come on until around 225 degrees unless of course you have the air con on.

Oct 03, 2009 | 1998 Cadillac DeVille

2 Answers

Whats normal operating temp for 94 sts northstar

The thermostat opens at 196F, but sitting idling, the coolant fans may not turn on til' 125F.

Sep 22, 2009 | 1997 Cadillac DeVille

1 Answer

Engine over heats 2000 cadallic deville northstar engine

flush your radiator first.with the thermostat out you should see the water moving if not bad water pump.this engine needs the thermostat to function properly and either a 50/50 coolant or straight coolant so it does not boil over.also make sure your fans are coming on

Sep 20, 2009 | 2000 Cadillac DeVille

1 Answer

94 4.6 deville coolant hot,eng hot ,limp mode

pull codes from on board diagnostics turn key on not running press and hold hot button on temp and off at same time till dash lights up write down codes respond with all computer codes i will help you determine prodlem and try to fix

Aug 21, 2008 | 1995 Cadillac DeVille

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

439 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cadillac Experts


Level 3 Expert

85239 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8984 Answers

Are you a Cadillac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides