Use the long life 50000 mile five year brand It is orange in color and is made for aluminum block engines. I personally don't wait 5 years or fifty thousand miles. but that is recomendation for product. There are several brands available
It takes the green Antifreeze
R-134A
5W30 weight.
GREEN color.
Dexcool is recommended.
Dexcool
Was built with Dexcool
A Blaster is air cooled, not water cooled. no antifreeze.
dex-cool antifreeze is what came from the factory.
Dexcool ORANGE in color.
Any brand of antifreeze can be used in a 1998 Chevrolet Blazer. It is recommended that a person uses 50 50 antifreeze.
today's antifreeze is very much standardized. you go to any auto supplier buy a standard antifreeze and follow the instruction will give you a new fill of antifreeze