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

Posted by michele miller on


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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


5 Related Answers


Clint Smock

  • 4669 Answers

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


Chris DeHoyos

  • 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



  • 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

Ron Hatcher

  • 94 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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Over heating


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What do you usually see on other vehicles
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Why would you bypass a heater core?
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Use an infared gun & combustion gas tester

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Car is overheating, im trying to change the water pump and the thermostat. but i cant get the water pump off, and i cant find the thermostat

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