Bleed cooling system - 1998 Pontiac Grand Prix

https://www.google.com/search?q=When+bleeding+02+Lincoln+v8+cooling+system%2C+what+does+equalizing+the+system+mean%3F&oq=When+bleeding+02+Lincoln+v8+cooling+system%2C+what+does+equalizing+the+system+mean%3F&aqs=chrome..69i57.1140j0j15&sourceid=chrome&ie=UTF-8#kpvalbx=_6bAUYMy-EYPK_QbgmLXICA38

pressure in motor will help push out air to bleeders

Bleeding the coolant system Leisa, Check the attached links,instruction and guides on bleeding cooling systems. Good luck
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How To Bleed Cooling System EricTheCarGuy

Helen, if it is the radiator in your car that was changed, you may have air in the cooling system that needs bled out. May also be a failing water pump, thermostat,etc.
Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
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How to Bleed Air From Your Cooling System DoItYourself com

Remove rad cap while cold start and run engine making sure to keep it full also check for air bleeds along the system usually near tstat or on top most cooling system component

Rodney, first thing I can think of, the coolant system has an air lock in it. when changing a radiator now a days, the coolant system has to be bled properly for a successful install. Other than bleeding for air, you may have a faulty plugged core radiator. You did plug your fans back in right. links below on how to bleed air from cooling system.
How To Bleed Cooling System EricTheCarGuy

How to Bleed Air From Your Cooling System DoItYourself com

https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwiOotyLlInLAhVCdR4KHdTpAe4QFggbMAA&url=http%3A%2F%2Fwww.instructables.com%2Fid%2FHow-to-Burp-your-cars-cooling-system%2F&usg=AFQjCNGscHjEvt6J8S0vwf6Ma5PDjplPCQ

bleed cooling system

Most likely you have air trapped in your engine, particularly in the heater loop. You need to properly bleed the air out of your radiator cooling system. The hot and cold blasts of air coming from first hot water followed by air.
Read up on how to bleed air out of your radiator system. Some systems are very difficult to bleed.
If after doing a good bleed of the radiator system the problem returns, you may have a bad head gasket or other leak in your cooling system which is injecting air into the cooling system (radiator/water cooling system).

If you have a blown head gasket, surely you will overheat because some hot combustion gases are entering your cooling system. No way you can remedy it by bleeding the system. Bleeding the system is just removing the trapped air in it. Running the engine with out the radiator cap will do the trick.

look at your top radiator hose is there a small bleed valve at the top of the thermostat housing when the upper hose attaches to? If so loosen the bleed valve and allow the cooling system to purge the air out of the system you can tell when the air is out of the system when a steady stream of coolant starts to flow out of the bleed valve, if there is no bleed valve take the top radiator hose off of the engine side and allow the cooling system to purge the air out through the top of the engine that way

Theres a strong possibility being you just changed the coolant a few weeks ago that theres air in the cooling system not allowing the coolant to cirrculate properly, look at your top radiator hose is theres a small bleed valve at the top of the thermostat housing when the upper hose attactes to? If so loosen the bleed valve and allow the cooling system to purge the air out of the system you can tell when the air is out of the system when a steady stream of coolant starts to flow out of the bleed valve, if theres no bleed valve take the top radiator hose off of the engine side and allow the cooling system to purge the air out through the top of the engine that way, but it definatly sounds like theres air in the system not allowing for the cooling system to cool properly...