Noticed a sticker on the engine that says the refilling of the radiator  is a special procedure.
Could someone explain please?  

Nobody ever heard of it?
Or can someone suggest a thread in the archives.  

you have to wear special protective gear like a viking helmet, an athletic cup, and bowling shoes. You pour in one(1) quart at a time, in between quarts doing the macarena dance. Every third quart you have to do a shot of tequilla. every second shot of tequilla, you take a lap around the house while singing Frank Sinatra's "My Way". When the radiator is full start the engine, bring it up to operating temp, check for leaks, top off coolant level following the procedures above, replace old radiator cap with a new one.
I'm just kiddin'!! Nobody with any sense would wear fire boots with their viking helmet, that would look silly.  

What are you driving? Some models, ie: Fiero require a specific procedure to get all the air out of the system.
Steve  

Barney....Can't believe I was so stupid as to not put down the car.
It is a 98 Firebird V-8
And I do have a Fiero which I know requires burping..............Thanks for your help.Cliff  

I can burp most of the alphabet!  

Try asking a tech at your local dealer. I haven't worked on any 4th gen f-bodies, so I'm sorry I can't help you.
Steve  

I know you don't want to mix Dexcool with conventional antifreeze. It becomes a gasket eater. Stick to the Dexcool it came with.