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Just bought 97 eldorado w northstar engine. On way home, it over heated. Had to fill with water. It was empty. The guy just had water pump and therm replaced. I don't see any signs of water leaks anywhere. But still over heating. What can I do? Thanks. Derek

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  • Cars & Trucks Master
  • 45,343 Answers

Have a compression test done to determine a head gasket or cracked head. Have a coolant system pressure test done to test for system leaks.. Check that a thermostat was installed correctly or was in fact installed as you need one to maintain correct flow rate to allow heat to move to the radiator fins and to the air flow.

Posted on Jul 28, 2013

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Posted on Jan 02, 2017

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  • 11 Answers

SOURCE: replaced water pump. thermostat. radiator, filled

Try backflushing,if this doesn't solve the problem,..then it could be the distributor,they can make the car run hot if the are going out.

Posted on Apr 13, 2009

csmock132
  • 4669 Answers

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

  • 3600 Answers

SOURCE: oil pump replacement

The pump is located in the pan you have to remove the transmission bolts out and raise the engine up with an engine stand and remove oil pan bolts and remove pump, it's quite a job.

Posted on Aug 14, 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

thunderalley
  • 432 Answers

SOURCE: 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

Posted on Oct 04, 2009

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1 Answer

97 northstar purges coolant after 50 miles tested cooling system..... i might be crazy but this thermostat before the water pump system makes no sense i think with the restriction of water to the pump


Can you explain your problem more ?
The thermostat should be at the end of the upper or lower radiator hose to block flow to the radiator. The spring must be on the engine side to get the engine heat to open.

Apr 20, 2013 | 1997 Cadillac Eldorado

2 Answers

OVERHEATING ON 91 BLAZER


You would have air pockets with a new thermostat and none if you leave it out.
Are you sure you are burping the cooling system with the new thermostat installed ?
Its also possible you have a leaking head gasket or other problem that is being amplified by having the thermostat installed. Something may be heating up with and not without.

Mar 04, 2013 | Cars & Trucks

2 Answers

1999 Cadillac eldorado overheating. Changed thermostat, still overheating now with white smoke coming from exhaust. Checked water pump belt, it is there and turning. Cold air blowing from heater, no heat.


coolant leaking into engine probably blown head gaskets. More damage will occur the more you drive it. Unfortunate and expensive repair on a northstar.

Aug 24, 2011 | 1999 Cadillac Eldorado

1 Answer

Need a diagram showing exactly where the water pump is located on a 97 cadillac deville northstar


zjlimited_1587.jpg

Fig. Water pump assembly-4.6L Northstar engine (click image for zoom)



zjlimited_1588.jpg



Fig. Remove the water pump belt shield


zjlimited_1589.jpg


Fig. Remove the water pump adjuster pulley retaining bolt and


zjlimited_1590.jpg


Fig. Remove the water pump retaining bolts




Hope helps.


Jul 16, 2011 | 1997 Cadillac DeVille

1 Answer

97 cadillac eldorado trng i put a new water pump


is the fan coming on? are you losing water out the radiator? if the head gasket is blown it can be blown into the oilpan the oil will be milky it can be leaking out the side of the heaqd at the block or going into the cylinders and out the exhaust you can also have a bad thermostat i have bought bad new ones one way to test it is take it out and boil it in a pan of water it should open about 180 to 190

Jun 05, 2010 | 1997 Cadillac Eldorado

1 Answer

97 cadillac eldorado overflowing through overflow pipe


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(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.

Apr 11, 2010 | 1987 Cadillac Eldorado

2 Answers

Where is the thermostat on a 1999 cadillac el dorado


northstar? is located on driverside wher the water pump is right infront of the radiator. it has 2 10mm bolts holding the thermostat in place. the engin coolant temp sensor is located on the driver side on the motor towards the fire wall

Feb 12, 2010 | 1999 Cadillac Eldorado

1 Answer

How do i change the water pump


What engine do you have? if its a Northstar engine then you need the special Northstar water pump socket before you can do anything

Nov 13, 2009 | 1994 Cadillac Eldorado

1 Answer

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.

May 29, 2009 | 1993 Cadillac Eldorado

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