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2000 cadillac northstar running hot - 2000 Cadillac DeVille

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  • Contributor
  • 29 Answers

I just had to rebuild my wife's Northstar. You have a bad head gasket. Her's was doing the same thing, and not showing traditional signs of head gasket problem. (IE: white smoke) It was just overheating with normal use.

Posted on Mar 03, 2011

  •  Mike King
    Mike King Dec 14, 2016

    These vehicle are notorious for having head bolt hole threading failure. With a combination of poorly selected head bolts with a thin pitch as well as poor block casting techniques. In a lot of cases with that particular Motor you get combustion chamber gases leaking into the cooling system and a telltale sign is after the vehicle has sat for a while when you go to start it up it misses horribly, as coolant has leaked into a cylinder/cylinders thus fouling out.

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6ya6ya
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Posted on Jan 02, 2017

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csmock132
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SOURCE: '99 cadillac eldorado, Northstar engine w/AC problem

Have you unhooked the battery since you put the freon in? If not, do it.

Posted on Jul 04, 2009

Kravcar
  • 192 Answers

SOURCE: 98 Cadillac Northstar motor running hot in 30 min.

The normal operating temperature for the Northstar engine is around 210 degrees.
The fans will not come on until the temp hits 225 degrees.

The thermostat in the northstar engine is located at the bottom radiator hose (unlike most conventional cooling systems).

The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,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.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.

If the other end of your purge line is not connected to anything then that is the problem......it must be reconnected otherwise the cooling system is not pressurized.

Posted on Apr 20, 2010

Kravcar
  • 192 Answers

SOURCE: i have 1998 cadillac seville w/northstar motor

The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
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.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.

Posted on Feb 25, 2010

  • 173 Answers

SOURCE: high idle on 95 cadillac seville 32v Northstar 103,000 mi

trottle position sensor out of range. hold down warrmer and off button on the cluster it should display codes . write them down and post them on fixya.

Posted on Apr 11, 2010

duane_wong
  • 6826 Answers

SOURCE: fuel door and trunk release don't work 2000

check that the valet feature in the glove compartment is not activated or deactivated by pushing the button to toggle.

Posted on Aug 03, 2010

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My 2000 cadillac deville keep running hot when i drive it.the coolant shoots out the coolant tank when i open it.i changed the radiator and the thermostat.i don't think a head is blown cause it dosen't...


OK, check that the 2 fans are turning on when it gets to operating temperature. If not, replace the 3 or so relays that control the two speed fans on your car.If that doesn't solve the problem, then you may have to buy new fan motors and also have the harness replaced if necessary to make it cool reliably.

I had this problem on a 1997 Cadillac Deville Limousine that overheated over 157 deg. F and went into its limp mode for cooling the engine off by allowing 1/2 of the cylinders to circulate fresh air into the engine in case all antifreeze would leak out or the car would overheat.

Don't run the Northstar engine too long, more than 45 min. at a time in this limp mode.

Good luck on this repair of your Northstar Engine.

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REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP TO BE ON THE SAFE SIDE.I SEEN CADILLAC RUNS A 192 TO 199 DEGREE THERMOSTAT.CADILLAC 4.6L 4.9L ENGINES ARE BIGGER THEY RUN A LITTLE HOT THAN MOST ENGINES.

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Engine over heats 2000 cadallic deville northstar engine


flush your radiator first.with the thermostat out you should see the water moving if not bad water pump.this engine needs the thermostat to function properly and either a 50/50 coolant or straight coolant so it does not boil over.also make sure your fans are coming on

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1 Answer

'99 cadillac eldorado, Northstar engine w/AC problem


Have you unhooked the battery since you put the freon in? If not, do it.

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