Question about 1998 Cadillac DeVille

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My 1998 deville is overheating, no signs of blown head gasket. Changed the thermostat, water pump belt and tension pulley. Fans are not coming on. need help.

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  • Bruce Goins Feb 22, 2012

    where is the coolant temp sensor located? thanks to all in advance.

  • rick
    rick Feb 22, 2012

    the coolant temp sensor is usually located near the thermostat housing, becarefull cause you might see 2 that look similar, 1 is the coolant temp sensor and the other is for your temp gauge in the dash, also did you you try switching the relay with one of the others next to it, they are usually pretty universal

  • Bruce Goins Feb 22, 2012

    thanks. I'll try both.

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Posted on Jan 02, 2017

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csmock132
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SOURCE: 1997 cadillac deville overheating

Remove the cap from the coolant bottle and fill it all the way to the top. Then start the engine. Does the coolant shoot from the bottle?

Posted on Jun 26, 2009

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SOURCE: overheating

It's the head gasket. I've had all that work done and finally found out that it's the head gasket.

Posted on Aug 04, 2008

dennymulford
  • 1055 Answers

SOURCE: 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

Posted on Feb 26, 2009

roniecon
  • 6826 Answers

SOURCE: The temperature in our 1998 Cadillac Deville goes

check for air in system(cooling system) also check to see if cooling fans on radiator come on when car reaches about 225-230degrees, if not check relays and fans to see if they ar good if so see if both of them work (they should) if they both come on see if they go off if they dont ever go off then the engine is not cooling down have a tech. check it out ,could be a blown head gasket or worse

Posted on Jun 28, 2009

Kravcar
  • 192 Answers

SOURCE: 1993 Cadillac Eldorado overheating

I am assuming you have the Northstar engine.

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.

Are you running it without a thermostat? If so,then strangely enough,this will cause overheating as the Northstar cooling system is different to most conventional systems and therefore will not help you diagnose the problem.

Posted on Aug 22, 2009

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Why does my cadillac 1998 deville keep overheating?


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Jan 30, 2010 | 1997 Cadillac DeVille

1 Answer

Dont know where thermostat goes. engine overheating, coolsnt not cycling.


The thermostat is bolted into the bottom of the water pump, the lower radiator hose connects to a cover that holds the thermostat to the water pump.

the thermostat can be difficult to get at because the AC and power steering pump are all bolted on top of the water pump,

Your problem may not be a bad thermostat.
I would also check:

1) water pump, some of the vw pumps are poorly made & tend to go bad.

2) fans belts, it can be tricky to get the right tension on these belts due to a badly designed tensioner system on the power steering & water pump belt.

3) hoses, radiator, coolant tank,. the radiators and coolant tank tend to leak when they get old, the plastic cracks or the rubber seals go bad.
Also check the electrical system controlling the engine cooling fans. there are sensors and relays that can go bad.
I have owned 8 vw's most of the major problems with these cars was due to electical problems.

4) Engine problems such as a blown head gaskets, or ignition timing problems can cause overheating. luckily VW engines usually don't have these problems, unlike other companies 4 cylinder engines (the Dodge Neons for example)



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