Question about 1998 Cadillac DeVille

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We have a 1998 Cadillac Deville, we have to keep putting water in it everyday, its no leaking water, its like the water is just evaporating, there is no water in the oil, so what can the problem be?

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Worst case it could the head gasket.Do you see any white smoke or moisture coming out of the tailpipe?
If the head gasket is blown the car will run a lot hotter than the normal (190 to 210 degree)....
You may need a mechanice to confirm this before panicking .

Posted on Mar 04, 2009

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Its a bad water pump leaking while driving

Posted on Feb 23, 2009


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1 Answer

I have a 1998 cadillac deville ,how can I tell if

You have a Cadillac! You can assume that the thermostat is bad, the intake manifold is leaking and that you have a connecting rod or 2 going bad. Caddy engines do not last without constant maintainance.
You can spray water on the intake while the engine is running....if the noise goes away, you have a leak.

Nov 02, 2013 | 1998 Cadillac Catera

1 Answer

Cadallac Deville 1998 water leaking on floor board. and over heating

check the heater matrix for leaks. have you got a film of slimy fog on the inside of the windshield and does it smell sweet in the cabin. if so this is glycol escaping from the heater matrix

Sep 28, 2013 | 1998 Cadillac DeVille

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My 98caddilac deville keeps running hot,i put thermostate,waterpump i took it to shop they did a pressure test it all check out good . i was told it could be my passenger side fan but i think it should be...

I have a 1997 Cadillac Sedan Deville that did the same thing. I replaced the same things you have replaced on yours. The end result was a blown head gasket which I have found out is very common on older model Cadillacs that we own. After replacing the head gasket (which cost me parts/labor $2,200.00) at a reliable mechanic's shop that I have used for over 20 years, the car does not over heat. When I replaced the head gasket, my Cadillac had 131K. However, I have seen blown head gaskets on Cadillacs (similiar year/model) with as little as 50k at used car dealerships. Cadillacs are terrific vehicles but I've found out that bad head gaskets on older models are common problems. Good Luck...Hope this helps a little. A. Levisy in Virginia

Nov 09, 2011 | 1998 Cadillac DeVille

1 Answer

1998 Cadillac devil leaking all water out

if it is leaking on the trans side of car it is probally the water pump on the Northstar engine.

Jul 27, 2011 | 1998 Cadillac DeVille

1 Answer

I have a 1998 cadillac deville, that is over heating

check thermostat, put a coolant pressure tester to check for leaks. check radiator for fluid levels.
check to see if electric fan is working.
start car,when cooled, open radiator cap and check to see if its flowing,if not, then could be a bad water pump.
check carpet under dash for wet spots to indicate if heater core is bad.
any one of those could be at fault.

Apr 02, 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 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

Runs cool for about 15 miles then it gets hot(220) so i turn it off to let it cool about a half gallon of water is gone

220 to 230 deg. F is actually normal for the 1998 Cadillac Deville. If it goes to 250 deg. F or even 260 deg. F it goes into a limp mode where fresh air is pumped into 1/2 of the cylinders to preserve the engine up to 40 mi. of travel (in the case that a radiator fan isn't working or coolant has completely leaked out of the system).

If a half gallon of water is gone in the system and you keep losing it, there is a leak in the system say in the water pump o-ring or the radiator, or a hose.

Jun 28, 2010 | 1998 Cadillac DeVille

1 Answer

How do put freon in a cadillac deville concourse

the answer is simple. you DO NOT!! Even a \licensed mechanic can not if the situation doesn't warrent it. These situations are controlled by the EPA to reduct ground water contamination and putting OSONE IN THE AIR.

Jun 20, 2010 | 1999 Cadillac DeVille

1 Answer

Where is the fan relay switch for a 1998 cadillac deville

If for the heater it is a blower module on top of the evaporator core housing. If for the cooling fans it is inside the front fender behind the headlights. That is a module also tice the size of a normal fist

Jan 29, 2010 | 1998 Cadillac DeVille

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