Question about 1999 Cadillac DeVille

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1996 Cadillac Deville overheating- head tested, no water in oil, thermostat changed, water pump checked rad flushed, no leaking hoses, etc - could it still be te radiator

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  • yadayada
    yadayada May 11, 2010

    HEAD GASKET IS LEAKING.

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  • Cadillac Master
  • 22,219 Answers

Remove pump and check that the imèller which is plastic hasnt seperated from drive shaft

Posted on Jul 16, 2009

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1998 Cadillac Seville SLS with overheating problem. Head gaskets repaired!! cost me 4K, all hoses checked and look good, belts replaced etc etc. Still overheats!! The cooling system (heating/AC) is acting...


did you change your thermostats there is one on the motor and on radiator. i have a toyota and was told my motor was shot it was overheating and loosing coolant my prob was water pump and the radiator filler pipe had a pin hole in it. if you do not have water in your oil or oil in the rad then it is probabnly not the head . also if the fin on your radiator are bent you may need too change radiator..Also your radiator fan may not be working, you can hook direct or buy a new fan relay sensor that plugs in at the bottom of raiator, you can check this by getting motor hot and see if fan kicks on

Jul 23, 2011 | 1998 Cadillac DeVille

3 Answers

Engine keeps overheating


I'd start with replacing thermostat (that's the most common fault) Other possibilities; waterpump,leaky hose, radiator cap (not holding pressure), fan belt broken. I'd inspect for belt & leaks - if good replace thermostat.

Feb 28, 2011 | 1998 Cadillac DeVille

1 Answer

Slowly overheats after about 8mi.radiator cool at that time ,water pump running(good belt,not leaking) hoses hot also keeps neediding coolant top off but no leaking under car.no water in oil or evident...


That's about the right amount of time for a thermostat to start opening. If the rad is cold and the engine is overheating then get the thermostat changed. It's likely sticking closed. This situation would also cause your coolant to boil in the head and evaporate the water out of the mixture. That's why you need to keep topping up. Hope this helps.

Sep 17, 2010 | 1998 Cadillac DeVille

1 Answer

How often does a thermostat in radiator system need to be changed


if car has not had good coolant additive to protect the water system then thermostat will not last long, also if that is the case flush out with cleaner then replace thermostat, over heating can be caused by a number of other things like blocked rad head gasket leaking

Jan 03, 2010 | 1997 Cadillac DeVille

2 Answers

96 cadillac 32v over heating. thermostat is replaced and no water is leaking but after 30 mins it hot. no water in the oil.


this sounds like the rad is blocked up, if it was a head gasket it should boile up a lot sooner that that, you may need to have the rad flushed out or deskeled

Nov 12, 2009 | 1996 Cadillac DeVille

1 Answer

2001 cadillac deville, overheats without loss of coolant


First, provided their are no visible coolant leaks and/or loss of coolant with no signs of leaks, I would thoroughly flush cooling system and replace coolant, then check and/or replace thermostat (you can place thermostat in boiling water to check for proper function), if you have tried these 2 steps and still are experiencing overheating you may need to replace your water pump which can be a tricky job if you're unfamiliar and try to do it yourself, however, I could walk you through it if necessary. Also visually check your radiator hoses for bulges, wear ,etc along with heater hoses etc. You may want to also check radiator fins to see if they are dirty/obstructed and clean if necessary. Let me know if I can assist you further and how it works out

Aug 30, 2009 | 2001 Cadillac DeVille

1 Answer

Same problem , car has only 86,000 miles


replace that thermostat again...flush radiator any way...then see how it runs...

Aug 28, 2009 | 1996 Cadillac DeVille

2 Answers

1994 Honda Civic LX\overheating within 2 mile drive


Remove and raise upper hose at thermostat end and remove lower rad hose.
Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily.
Honda rads are cheap.....any restriction....replace rad.

Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose.
Flush good.

Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.

Stop leak can plug everything.

Also.......not likely causing over heating....but ....at your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW!
Water pump is optional at this mileage.

Aug 23, 2009 | 1998 Honda Civic

1 Answer

Problem with overheating on 1996 Cadillac Deville with Northstar engine. The information screen read "engine overheating", "idle engine" and "change oil" all within one minute. Are these issues related...


The oil life resets to zero after the engine overheats. Check for external leaks first, make sure the water pump belt is still there and turning. The most likely cause if the car has over 70,000 miles is head gaskets.

May 18, 2009 | 1996 Cadillac DeVille

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