Question about 1998 Cadillac DeVille

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Why does my 98 deville continue to overheat?

Why does my 98 deville continue to overheat when ive added a new thermostat and radiator and water pump and resevoir bottle?

Posted by s_v_g_chub on

  • Anonymous Mar 02, 2009

    car getting hot

  • navyhm7 Mar 04, 2009

    My cadi overheated again, even less than3 months after replacing the rad, the thermostat and water pump. The head is now cracked. I WILL NOT BUY ANOTHER CADILLAC ANY MORE!!!



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Check to see if there is a valve (usually vacuum actuated) inline somewhere on the lines that go from the block to the heater core. Maybe it is stuck...

Posted on Mar 02, 2009


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2 Answers

1994 Toyota Camry,New water pump,new radiator,but car is over heating and missing,it smokes from the radiator when I stop....

Did you replace the thermostat? How long does it take to overheat? Is there water coming out of the tailpipe? Do you have to keep adding water to the radiator?

Sounds like a blown head gasket from the engine miss. Pull the spark plugs, if any of them are kind of a bleached white on the electrode then you've got water in that cylinder and either a blown head gasket, cracked head/block, or a combination of those.

Good Luck!

Sep 01, 2014 | Cars & Trucks

1 Answer

98 caddy deville overheating changed the water pump and thermostat

Run the car without the thermostad to see if it still overheats. If so check the heat sensor it might be faulty.

Aug 01, 2012 | 1998 Cadillac DeVille

1 Answer


check belt tension for the water pump if belt too loose pump will not send enough water in and will cause your engine to overheat, also check that your coolin fan is working,

Oct 12, 2011 | 1998 Cadillac DeVille

1 Answer

Changed water pump on my 98 deville but it stills overheat

What do you think is overheating? 220 is not overheating.
Is the engine cooling fan coming on?
Any debris (dirt, leaves, bugs, birds, etc.) stuck in the radiator or A/C condensor? (the space between the condensor and radiator is like a belly button, its a space that collects a lot of stuff).
Also it is never a bad idea to change the Thermostat.

Sep 27, 2011 | Cars & Trucks

2 Answers

No heat on my 98 caddy deville delegance?

do the heater core coolant supply hoses both get hot at the firewall in the engine compartment? if yes then you have a defective temperature control blend door actuater motor.

Oct 17, 2009 | 1998 Cadillac DeVille

2 Answers

1996 cadillac deville overheat..radiator?

Check for coolant flow at the Purge line,this is a common problem on the Northstar.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.

Aug 20, 2009 | 1996 Cadillac DeVille

2 Answers

My cadillac deville overheats a lot, why does it do that?

Check the radiator, hoses, and water pump for leaks. If you don't see any coolant loss, the problem is most likely a faulty thermostat. Hope this helped and best wishes.

Aug 10, 2009 | 1997 Cadillac DeVille

1 Answer

4.6 lit cadillac overheats although I replaced the thermostat

did you try replacing the radiator cap and the temp sensor?

Mar 31, 2009 | 1997 Cadillac DeVille

2 Answers

98 Cadillac De Ville overheats gpoing up hills

As an added thought. With the overheating documented as GM Elec posted. Have the serpentine belt and especially the belt tensioner checked. Tensioners will fool you sometimes.

Mar 27, 2009 | 1998 Cadillac DeVille

1 Answer

No heat

check for air bubbles in the system also check the pressure cap and have it tested also squeeze the upper radiator hose together and if it doesn't open up in your hand right away the water pump could be weak work on getting the air bubbles out first before going to the water pump

Jan 22, 2009 | 2002 Mazda Millenia

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