The best way is to do a compression and/or leak down test. If it's overheating in a fairly short amount of time it's probably a bad gasket or cracked head. Using antifreeze without any visible leaks is a good indication.
To replace a blown head gasket on a 1998 Chevy Lumina, it would cost between $18 and $174. This depends on the brand part and any labor costs.
My 1998 Chevy Lumina has air conditioning. I assume that was the question if Luminas come with a/c.
where are the ports to recharge the air conditioning on a 1998 chevy lumina car with a v6?
does the 1998 Chevy lumina have a fuel shut off switch
schematic of 1998 chevy lumina ltz 3.8l air conditioner
yes
The spark plug gap for a 1998 Chevy Lumina (with 3.1L or 3.8L engine) is .060".
Check the vin #'s because in the 1990's Chevy called their smaller line of vans "Lumina" also.
shoes
possibly a blown headgasket or maybe something other than coolant inside
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