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I just drove my 1999 Cadillac deville 64 miles to and from destination.., went to ho jump in car to go to work,got there the temp says 250 and all kinds of water leaks out from somewhere.it just had a new radiator put in 3 weeks ago.

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  • 17 Answers

Try checking the drivers side of the engine,there is a pulley running off the cam that runs your water pump with a small belt. Many times I have seen these things so shredded they came right off and the temp skyrockets. Also, when a motor over heats, it's like a pressure cooker...so any loose hoses,clamps ect. Will leak due to over pressure

Posted on Oct 21, 2013

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Posted on Jan 02, 2017

  • 2 Answers

SOURCE: 1999 Cadillac coolant leak,can not find

ok...here is my experience with our 1999 Deville. We had the same problem with ours almost 8 months until we had the coolant flushed and filled. That is when our problem reared its ugly head. As you probably already know, this Northstar engine does have well known issues with head gasket failure as well as head bolt issues and last but not least, thermostat problems. If you haven't had an "official" overheat ( not just the coolant low light, but a true blue overheat where car has safety to shut down or run on half the cylinders) you should be fine and your engine healthy enough to repair.

I would dare say it is your head gasket. The first thing you should do is pressure test your sytem, this will diagnose whether or not it is infact your head gasket. It could also be a head bolt(s) that pull from the block when car gets too hot. If either of these things are the problem, be prepared for the investment and be sure that whoever does the work on your engine knows how to diagnose whether your engine is good enough to repair. Cadillac service bulletins instruct dealerships to replace the engine in this case, but you can repair an engine that is healthy enough. It is costly and you must love your car, but if the love is TRUE, you will love it more when it is repaired.

You did mention that the oil is fine...I know you wereprobably looking for coolant.....when these head gaskets go, the coolant doesnt necessarily mix with the oil, in fact, we didnt have that problem at all. Our coolant was shooting out the tailpipe and evaporating. You could probably check your spark plugs for coolant residue, but you would have to be sure to check them all, because you will probably have the problem in only 1 cylinder. The best way to get a yes or no is the pressure test. Good Luck!

Posted on Apr 07, 2009

  • 78 Answers

SOURCE: 2004 honda civic overheats

You might have a sticking thermostat. If it's sticking shut, it won't open when needed and the engine will overheat. Even though the water in the radiator is not hot then, the water in the block of the engine is boiling.

After that overflow, the cooling system was underfilled, so when the thermostat finally did open, it had plenty of room to refill, which is what you saw when the water got "suddenly sucked in".

My recommendation is to replace the thermostat (and gasket), because as a point of diagnosis, it is a relatively cheap part but can have terribly inconvenient consequences when malfunctioning. If you're handy, get a Haynes or Chilton manual from the auto parts store and do it yourself.

Also, the radiator cap is not good to mess with when the engine is hot. Doing as you did by opening it while overheated upsets the balance between the coolant in the block and radiator. There's a small rubber hose from the top corner of the radiator to a plastic (probably translucent) overflow tank on one side of your engine compartment. Under normal circumstances, you should check the coolant level there, as it exists to keep the system in balance. Note that I said "normal" - which means anytime it hasn't overheated to the point of leaking out of the radiator cap or leaking elsewhere.

Posted on Jun 10, 2009

  • 33 Answers

SOURCE: 1999 Cadillac Deville and the radiator fans are not coming on

you should check the fuse in the fuse boxe under the hood and find the radiator fan fuse
if the fuse is no longer good the little piece of metal will be cut in the middle so replace it with the same number if it's a 20 AMP do not put a 30 or a 15 AMP
if the fuse is good then there might be some problem with wires (could be cut) or the radiator fan motor is no longer good
you should have it check
Good luck

Posted on Jun 19, 2009

roniecon
  • 6826 Answers

SOURCE: 1997 Cadillac Deville Overheating

Yes it can be the head gasket,one way to tell,is make sure the engine is cold,like in the morning.Take the rad.cap off,add water until full.Turn over the engine and let run,while looking at the opening(where the cap goes).Is the water coming out like really fast,maybe as much as a fountain?If so,then it is a head,or head gasket.If you would like to bleed system of air I can tell you how.If there is air in the cooling system,it will run hot.With it cold,or cool,not hot or real warm,fill the reservoir with water up to 3/4 full,over the fill mark.Fill the radiator full,and replace radiator cap,and reservoir cap.Make sure the hose from the reservoir to the radiator is in good shape,no holes or crimped anywhere.start the engine with the ac off.At this point the cooling fans should not be on.There not supposed to be on unless you straight wired them.Before the fans come on by themselves,or the vehicle runs hot,and right before not to soon,cut the car off.Go in the house and get on computer for about 30 to 40 minutes,and go back out side and check the water level in the reservoir.Is it down?if so add more water and repeat process until engine runs at normal temp.The fans should come on,and go off on there own,with the ac off.Let me know the out come.

Posted on Aug 29, 2009

  • 1 Answer

SOURCE: 1999 Cadillac DeVille Problem

1999 cadillac deville lights come on but wont go off

Posted on Feb 05, 2010

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