Question about 1998 Cadillac DeVille

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98 caddy deville overheating changed the water pump and thermostat

Changed the water pump and the thermostat and hasnt helped wat else should i be looking for what am i missing

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  • 6 Answers

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

Posted on Aug 01, 2012

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Posted on Jan 02, 2017

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csmock132
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SOURCE: 98 deville runs hot. i have already changed thermostat

You likely don't want to hear this but Northstar engine a common for head gasket failures. One good test that I use it to fill the coolant tank all the way to the top. Then start it up. If the coolant shoots out of the tank. The heads have a problem.

Posted on May 15, 2009

  • 90 Answers

SOURCE: trying to locate water pump on my 2000 caddy deville

Its on the same side of the engine as the transmission, driven by the belt up top. It requires a special socket to remove the pump from the housing.(also, the pump turns clockwise to remove!)

Posted on Dec 23, 2008

duane_wong
  • 6826 Answers

SOURCE: no heat on my 98 caddy deville delegance?

The heater core may be clogged up. Or the blend door isn't functioning correctly.

Posted on Sep 20, 2010

Ironfist109
  • 3018 Answers

SOURCE: overheating concours deville 1999, changed

  • After your repairs it seems you might have the 4.9 head gasket leak. What happened is GM did not cast the bolt bosses deep enough in the block. So they literally pull up and a head gasket leak occurs and overheats until the repair is conducted. Unfortunately this is a lot of money to repair. around 2002 or 2003 they corrected this. The repair will cost anywhere between $2,500 to $4,000 if the carriage has to come out.
Regards, Tony

Posted on May 02, 2011

  • 86 Answers

SOURCE: 2001 deville low coolant light is on, overheating.

blockage in rad, headgasket or maybe a faulty sensor,you need to get a presher test done on the cooling system first.

Posted on May 29, 2011

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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

1 Answer

Why is my 2000 cadillac deville overheating but not smoking


I bought a 2000 caddy Deville off the side of the road, had a 800.00 sign on it, pullover to see it, a man came out and said he had it to four shops and they can't figure it out. gave 700.00 for it and had to tow it home., flushed radiator, heater core, and engine out, changed thermostat, checked water pump. this Northstar engine would over heat when driving it. Turned out to be the plastic cover underneith, it hooks to the front bumper and goes to the metal frame to block the wind. when it is missing, the wind blows in and back drafts the radiator so the fans can't do their job and cool the motor. a five dollar cover from the junkyard and it was fixed, crazy hu. I hope this helps someone.

Jun 27, 2011 | 2000 Cadillac DeVille

1 Answer

Hi , my caddy is overheating when the car run over 80 miles i have changed thermostat , water pump and ridator but the car still over heating just when the cat run only ! it`s 2000 DTS


Maybe the Wrong water pump, there maybe a pump with a serpentine belt and one with regular fan belt. The pumps work in different directions. Or thermostat was put in incorrectly.

Jan 12, 2010 | 2000 Cadillac DeVille

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

1 Answer

My 1997 caddy is overheating i have replaced the radiator and the thermistat and hosses but it is still overheating after 2 miles


first check your thermostat make sure the spring is down toward the block,if thats ok I think you have a blown head gasket,I have seen some empellers on the water pump break up.I hope this helps you?

Oct 03, 2009 | 1997 Cadillac DeVille

2 Answers

98 deville runs hot. i have already changed thermostat


You likely don't want to hear this but Northstar engine a common for head gasket failures. One good test that I use it to fill the coolant tank all the way to the top. Then start it up. If the coolant shoots out of the tank. The heads have a problem.

May 15, 2009 | 1998 Cadillac DeVille

2 Answers

96 Deville Overheating....TroubleShooting


did you run a compression check? if so and its good then you have a blockage in the water jacket
if not then you have a head gasket leaking

Feb 26, 2009 | 1996 Cadillac DeVille

3 Answers

99 cadillac deville


hello i have a 1998 cadillac deville course. an i been having the same over heating problems with mine i been taking it to mechanics an no one seems to know even the caddy dealship its overheating i checked the termostat water pump radiator all hoses was wondring could you tell me what you did or what you are doing to fix your problems my email is teree1234@yahoo.com thank you very much

Aug 02, 2008 | 1999 Cadillac DeVille

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