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Tom porter Posted on Jan 02, 2019
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To flush out the old dexcool fluid out of my 1999 north star engine with 57 600 miles eldorado can i use o radiator flush?

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Jeff McCrea

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  • Expert 144 Answers
  • Posted on Jan 03, 2019
Jeff McCrea
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I'm truly jealous. I thought I got lucky when I bought my 2012 Lincoln in 2017 with 57,900 original miles on it. :) I'm not 100% sure but is that old north star an aluminum block? If so, I would consult GM as to what to use to flush it with. If it was still cast iron, you could probably get away with most any flush. The one thing that I would be careful of is if the water pump is the original, try to get something that is not too corrosive to protect the old shaft and bearing seals. Some of the heavy duty over the counter flushes contain carbolic or phosphoric acid to eat the calcium and lime scale out of your radiator. This is why they used to say that Coca Cola was a good flush because it contained phosphoric and CARBONIC ACIDS. Carbonic acid being the carbon dioxide dissolved in it to give it the fizz. Good luck.

5 Related Answers

Anonymous

  • 426 Answers
  • Posted on Nov 20, 2008

SOURCE: How can I flush my whole coolant system

Preferable to flush as much out as possible to get rid of the old stuff and can be done at home by undoing the heater hose at the fire wall and using the garden hose to force water through until it comes out clean Dont turn hose on full blast as it will spray out over everything build up to it so it doesnt make a mess.Make sure the heater is in the on position so that water comes out the pipe you took the hose off.Either way though it will still be ok to just undo the bottom radiator hose as the majority of it will come out.

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Ed

  • 479 Answers
  • Posted on Apr 20, 2009

SOURCE: my 1999 Cadillac Eldorado north

The thermostat is usually located on the engine end of the upper radiator hose.

Drain the radaitor of coolant, remove the upper radiator hose from the housing.
Usually a couple of bolts hold the housing in place, once the bolts are removed, seperate the housing from the engine, you should now see the thermostat, you will also discover it has a gasket to be replaced at the same time. make sure the surfaces are clean, use some gasket cement to hold the new gasket in place. reassemble the unit, reinstall rad hose, and refill radiator.

Hope this is od some help.
Ed

Anonymous

  • 490 Answers
  • Posted on May 01, 2009

SOURCE: Flushing Radiator and Replacing Coolant

yes you do
do this with the radiator cap off and keep adding till it is full after the thermostat opens let it burp all of the air out and keep topping off the radiator till the whole system is full

Craig Lovick

  • 247 Answers
  • Posted on Jan 07, 2010

SOURCE: '97 Ford Escort leaking auto transmission fluid.

The front seal could be replaced, and not have a problem. If you have a shop other than a transmission shop do the repairs, make sure the torque converter hub is inspected to make certain its not scratched/scorn. If the trans shifts properly and the fluid is not burned or smells burned, this would be an easy repair. If the trans fluid smells burned, and hasn't been serviced regularly, the rebuild would be the way to go. Also, ask what the warranty for any and all repair are on your vehicle. Normal warranty is 1yr, 12.000 miles in the automotive business.

Kravcar

Mark Carrington

  • 192 Answers
  • Posted on Mar 10, 2010

SOURCE: i have a 99 deville w/ 32valve north star engine

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.

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How do u bleed the water system for overheating?

The most common issues with the cooling system can be broken down into 3 categories. (Fluid Type) (Fluid Purity) (Stuck Thermostat)
(Fluid Type)
If your vehicle is cooled with *Dexcool* then your system will need to be flushed regularly. About every 7k-10k miles or so. The reason being, Dexcool congeals (gels) as it gets older, and will clog the entire system from radiator, to the heater core, stopping the flow of coolant.
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If you are replacing your coolant with tap water, it will not have the cooling capacity of a proper 50/50 mix.
(Stuck thermostat)
Coolant will not circulate if your thermostat is frozen shut. There are ways to test it, but in most cases, it is easier, and sometimes cheaper, to just replace it.
Now, to answer your original question, take the top radiator hose off at the radiator, then loosen the butterfly bolt located at the bottom of the radiator. Not all radiators are equipped with the bleeder, so simply take off both the top, and the bottom hoses. This will drain all coolant from the radiator. To do a "fluid flush" is a bit more difficult. Remove all hoses going to the radiator, remove the thermostat, and at the thermostat connection to the engine, purge the system using a garden hose tapped from your home. A shop will do the purge with 50/50 mix to flush the system and catch the old fluid as it comes out, but not needed if you do it at home. Flush the radiator the some way, using the top at the hose connection point. Just run the water through until it comes out clean. Reattach all hoses and thermostat. Go to your local parts store and buy a 50/50 premix that is appropriate for your region.(cooler for warm weather, warmer for cold) and do not add water. They come mixed ready to put in the vehicle. Make sure you fill it up where you are supposed to. If you have the old style radiator, the cap is located directly on the radiator. If you have a reservoir, fill it up to the line. *****Make sure you you start the vehicle to operating temperature to fill the reservoir to the appropriate level.***** I hope this helps. Good luck!

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follow the upper radiator hose to motor next to waterpump ,im guessing you have the north star motor.
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The heater core could be clogged. If your antifreeze is orange , then it is Dexcool antifreeze which causes slime and sludge to build up in the cooling system. It can clog a heater core. My suggestion would be to drain and flush the entire cooling system with Prestone Super Flush. Put in a new thermostat while your at it. Refill the cooling system with a green antifreeze that is labeled compatible with aluminum engine parts and radiators.Do Not refill with Dexcool antifreeze.
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Oil is in my engine coolant reservoir as well as my radiator

Most likely the intake manifold has a broken gasket or iteslf is broken.

take it to a shop and have them diagnose it by checking for HC's in your coolant. If there are non present, then it could be inside of the timing cover or the intake. If there are HC's present, you will need a new Head, Engine or just Head Gaskets, but if it's over 150,000 miles, you may want to just buy an engine if that's the case. You can't repair a high mileage engine with new top end components because it will "**** out" or ruin the bottom end shortly after installation.

Good luck! Hope that helps.

P.S. - I have mroe GM's come in with that same symptom than any other vehicle. After your repairs are complete, get rid of the DEXCOOL and go with a good, green antifreeze. It works much better than DEXCOOL.

Kevin, ASE Certified
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My 1999 Cadillac Eldorado north star is over heating, how can i change the thermostat? where is it located?

The thermostat is usually located on the engine end of the upper radiator hose.

Drain the radaitor of coolant, remove the upper radiator hose from the housing.
Usually a couple of bolts hold the housing in place, once the bolts are removed, seperate the housing from the engine, you should now see the thermostat, you will also discover it has a gasket to be replaced at the same time. make sure the surfaces are clean, use some gasket cement to hold the new gasket in place. reassemble the unit, reinstall rad hose, and refill radiator.

Hope this is od some help.
Ed
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