Question about 1998 Cadillac DeVille

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My 98 DeVille developed a coolant leak. It was coming from the water pump crossover gaskets. It was also running ruff for the first minute after starting. I dissolved 3 GM coolant tablets and poured it into the top radiator hose. No leak and it runs like a top. I have had the car 6 years and as far as using the tablets, mechanics are about 50/50 on using them. Could it be leaking coolant into the combustion chamber threw the EGR valve? What's up?

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6ya6ya
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Posted on Jan 02, 2017

  • 396 Answers

SOURCE: Coolant leaks, oil pan gaskets leak started

Check temp control sending unit and thermostat.

Posted on Jul 17, 2009

iambanshee74
  • 3489 Answers

SOURCE: Will a leak in the coolant crossover pipe cause my

no. a leaking headgasket or intake manifold will however.

Posted on Nov 02, 2009

  • 2002 Answers

SOURCE: Slowly overheats after about 8mi.radiator cool at

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.

Posted on Sep 17, 2010

  • 8 Answers

SOURCE: my 98 Cadillac Deville is

You did not mention if you replaced the thermostat. It may be stuck closed.

Posted on Jul 12, 2011

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Why is coolant leaking from underneath the center of my cadillac deville 1997? I've replaced everything that has to do with the coolant. There is no water nor fog on the passenger side floor


Well, if the coolant is leakimg from the HVAC drain, then you need a heater core, no matter what. You really have to jack it up and look, but I can give you a couple of pointers......

1. The water pump is leaking. That happens a lot. The coolant is leaking near the front of the car, near the center, but ever so slightly towards the drivers side. You need a special tool to replace it and I think gm has an updated cover and gasket.

2. The water pump housing is leaking. The gaskets that seal it to the block are made of plastic and deteriorate often. The coolant will be leaking at the center of the car, maybe up by the water pump, or back between the engine and transmission.

3. The heater hoses. I have only seen this 2 time, but the metal pipes corrode along the fire wall.

4. You could need a radiator. I have seen the side tanks leak a few times.....


Just A couple of places to look, but you have to get under and look....

Nov 07, 2014 | 1997 Cadillac DeVille

1 Answer

Water pump crossover housing gasket


For water pump replacement i suggest you to check the help link provided below.

click the link below :----

Water pump replacing procedure for all vehicles?

http://technoanswers.blogspot.com/2011/11/water-pump-replacing-procedure-for-all.html
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HOW TO REPLACE A WATER PUMP

http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-water-pump.html

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How to route Water Pump Belt for 1992 Oldsmobile ?

http://carbeltrouting.blogspot.com/2011/12/how-to-route-water-pump-belt-for-1992.html

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How to replace Water Pump on Car ?

http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-water-pump-on-acura-car.html

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How to Remove Water Pump?

http://technoanswers.blogspot.com/2011/12/how-to-remove-water-pump-on-toyota.html

-------
Where is Water Pump located ?

http://technoanswers.blogspot.com/2011/12/where-is-water-pump-located-on-toyota.html

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This will help. Thanks.

Feb 10, 2012 | 2000 Cadillac DeVille

1 Answer

98 caddilac deville running hot


The water pump is in the back of the motor on this one, it requires a special socket to remove and replace. If you have been scratching your head on this one, Cadillac had head gasket bolt issues, the bolts stretch and the gasket leaks internally.

Nov 01, 2011 | 1998 Cadillac DeVille

1 Answer

My cadi 1988 is running ruff and quit running feels like over heating but no leaks, just smells


REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.MAKE SURE COOLANT NOT LOW.IF ALL IS GOOD CHECK FOR LEAKING WATER PUMP WEEP HOLE IF LEAKING REPLACE WATER PUMP.MAKE SURE COOLING FANS RUNNING.IF ENGINE RUNNING HOT WHILE SITTING LONG TRAFFIC LINE AND COOLANT NOT RUNNING.CHECK COOLANT FAN RELAYS AND FUSE.IF ALL IS GOOD HOT WIRE MAKE SURE COOLING FAN MOTOR GOOD IF COOLING FAN DONT RUN WHEN HOT WIRED FAN MOTOR BAD.IF FAN MOTOR OKAY AND FUSE RELAYS GOOD YOU HAVE FAULTY COOLING FAN WIRING.YOU COULD HAVE BAD ENGINE COOLANT SENSOR OR FAULT IN ECM CODE SCAN TO CHECK THEM BOTH.CHECK ENGINE OIL.LOOK LIKE MILK SHAKE YOU HAVE LEAKING HEAD GASKET.IF OIL LOOKS OKAY.YOUR ENGINE BLOCK, RADIATOR AND HEATER CORE NEED FLUSHING.

Sep 20, 2011 | 1988 Cadillac Sedan DeVille

2 Answers

1998 cadillac deville leaking coolant, temperature was around 196 and when leaking started temperature has gone as high as 225, what is causing this problem?


This most certainly sounds like a water pump issue. The thermostate is located inside the water pump housing and if the pump is bad you'l lose fluids and need to add every day or so. The temp guage will run hot and often the heater won't warm up. You have even notice fluids on the ground below the front passenger side of the car. Try getting a pressure test first before replacing anything. That's a good place to start the diagnosis.

Dec 15, 2010 | 1998 Cadillac DeVille

1 Answer

My 2005 cadillac cts leaks coolant when idling for more than a few minutes after it is warm.


Try to add the recommended coolant sealant from the dealer. If this doesn't work then mechanical repair will be required.

For instance, I have a 1997 Cadillac Deville Limousine that I acquired, and it was leaking antifreeze through the o-ring of the water pump. Replacing the water pump was indicated and did so. But, after that the head gasket was leaking as indicated by a miss and fog coming out of the tailpipe. I repaired that problem by adding a $30 can of Bar's Leaks Head Gasket Repair, the kind that doesn't require draining the coolant system. That did the trick, and haven't had a problem since (for 3 months now).

Where is your coolant leaking from? Is the system within normal operating temperature?

Nov 08, 2010 | 2005 Cadillac CTS

6 Answers

White cloud of smoke through tailpipe


well I'd say that coolant is definitely leaking into the combustion chamber, albeit at a slow rate (for now). It could be anything from a blown head gasket to a cracked block or head. I'd get it to a shop as soon as possible and not drive it any more than need be until that point.

Oct 06, 2009 | 2000 Cadillac DeVille

3 Answers

99 deville head gasket leak?


A head gasket leak is usually indicated (among other things) by continous overheating of the motor, and subsequent loss of coolant.
It can also be indicated by the presence of engine combustion gas bubbles in the coolant resevoir.
Ensure the coolant system has no external leaks, such as faulty hose/s, radiator etc.

Ensure motor tune or other motor mechanical condition is not the cause of overheating.
I assume the motor is actually running hot.

Check cooling fans are operating ok (as necessary when car warms up):- if not check
1) fuse,
2) relay operation,
3) heat sensor switch.

Check/replace the thermostat,
Check the coolant pressure cap is serviceable & of correct rating,
Ensure cooling system is correctly filled, bleed off any airlocks as necessary when re-filling,
Ensure radiator hose on suction side of waterpump is not collapsing at engine revs above idle (due softening),
If the motor has been severely overheated, the head gasket could be blown - look for combustion gas bubbles in the coolant resevoir.

Sep 21, 2009 | 1999 Cadillac DeVille

1 Answer

2001 Cadillac Deville coolant bleed screw Location??


I had the same problem with my 2001 Cadillac Deville, like you I had replaced literally everything thermostat, water pump, radiator, temperature sensor, reservoir and cap, hoses etc....I didnt have any leakage. I was told I had air in my coolant system. After a lot of research and running across the right mechanic I was able to locate the bleeder and remove the air from my lines. No problem since. The bleeder is located on yhe left side of the radiator on the crossover, mines was sideways..Hope this helps someone before they spend money for new head gasket problems..Try this it helped me....

Mar 25, 2009 | 2001 Cadillac DeVille

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