Question about 1998 Cadillac DeVille

2 Answers

98 Deville Northstar temp runs up to 240 when idle

Runs rough at startup then reaches temp around 198 and smoothes out and runs very nice. temp will run up when sitting for 5-10 min but when I go agian it comes down and runs fine. Service engine soon is on and Autozone cmptr reads elec temp sensor that I cant locate. I just bought it 2 weeks ago and it does have some white smoke that clears when it wams up so I dont know if it was condensation. It is losing about 1/2 gallon antifreeze per week. Do I have blown head gaskets? Will any leak stop work? Thank you.199 Cadillac Coupe Deville, northstar engine, Check engine light comes on, goes off, engine temperature readings normally 196, go up to 244, come down within 2 minutes to 222, drop tp 198 in next two minutes. After a day of driving low on antifreeze about 3 pints each day.

Posted by on

  • Robert Lowder
    Robert Lowder Oct 16, 2013

    common problem is head gasket, i used bars leak with carbon fiber has worked for 6 mons so far, got it at autozone for 60 bucks

×

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 275 Answers

Might want to check that radiator for any leeks, if not check the watter pump for any leeks too, my car was doing the same 2 different times, first time radiator had a crack and was leeking, making me buy antifreeze almost every day, secont time was the water pump, was too old and started leeking , needed replacement

Posted on Dec 10, 2008

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Sergeant:

    An expert that has over 500 points.

  • Expert
  • 399 Answers

Check out the fuel pump and also the oil.

Posted on Dec 10, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

2 Answers

Check engine light flashing check engine soon smell of gas and not running smouth


Check engine light flashing means there is a bad misfire , it flashes to tell you your damaging your catalytic converter . You need to have it check , you don't won't to have to replace the catalytic converter . Can cost up to $1,000.00 . Flashing Check Engine Light CarMD

Feb 03, 2016 | 2004 Cadillac Deville

1 Answer

98 cadillac sls idling rough


try your ful injecton you mite have a injector clogged up try seafome it mite work cant hert to try

Apr 20, 2013 | Cars & Trucks

1 Answer

'98 cadillac northstar deville engine temp up to 240 after useing bars head gasket repair---how can this be fixed ??????


Hello: You may have a stopped up radiator. A temp sensing heat sensor will tell you. Auto Zone or advance auto. Are you sure the head gasket is not leaking? Does coolant fill up the surge tank and bubble with engine running????

Jul 30, 2011 | 1998 Cadillac DeVille

3 Answers

My 91 oldsmobile 98 runs rough in idle but when driving run smooth.


Rough idle is a very common problem on 4 cylinders, but I believe the 98 Regency has a 6 cylinder in it, right?

Sometimes the coil packs get iffy, and sometimes the EGR Valve gets a leak in it causing a rough idle.

When the accelerator pedal is depressed, it can change things so that the engine seems to run smoothly.

However, I would look for codes to see if anything intermittent is occurring in the engine that may need attention.

The OBD-I scanner can help to diagnose the problem, if anything is out of specifications on the engine in question.

The owner will have to find a technician that has such a scanner.

Aug 29, 2010 | 1991 Oldsmobile Ninety Eight Regency

1 Answer

Running temp around 199 to 226 how hot should the 98 deville run


The temp. should stay within that range, but should never be allowed to run 0ver 240, if it does you have a problem

Feb 13, 2010 | 1998 Cadillac DeVille

2 Answers

Engine idles rough for 90 seconds after restart when hot


sounds like the mass air flow sensor it is located on the air inlet try unplugging it and see if it runs better when it is running rough

Apr 09, 2009 | 1993 Ford Thunderbird

1 Answer

Over heating problem...


Could be a few things but either way, don't wait to have the cooling system checked out, do it now & possibly save $1000's later.
Check your coolant level first, make sure all belts are there. Rad fan should be coming on when it reaches operating temperature etc. Just bought it from who, a dealer? If it was a dealer head back to him a.s.a.p. and give him a chance to make it right, and pay close attention to what he says it is/was.

Dec 13, 2008 | 1998 Cadillac DeVille

2 Answers

98 Deville Northstar temp runs up to 240 when idle


Yes it is headgasket. Mine had same problem. Yours might not be severe as of now, you can try these other solutions. THERMAGASKET... Which you can buy online, and get your money back if it does not work... And stuff in a bottle at Autozone Repair headgasket with NanoTechnology! I would try and sell it quick, because these engines are very costly to repair and most mechanics wont even attempt headgasket repair, and plus you have to TimeSert the block...

Nov 24, 2008 | 1998 Cadillac DeVille

2 Answers

Dash Board Codes


190-195 is normal temp and what codes need reset

Nov 12, 2008 | 1998 Cadillac DeVille

Not finding what you are looking for?
1998 Cadillac DeVille Logo

Related Topics:

205 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cadillac Experts

yadayada
yadayada

Level 3 Expert

60960 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

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

Answer questions

Manuals & User Guides

Loading...