A small radiator leak can cause antifreeze to leak on your 1998 Chevy Lumina when there are not any spots on the ground. A pinhole in a hose can also cause this.
you likely have a leaking heater core. Is this on the inside of the vehicle? if so then it defintately is a leaking heater core
had a 95 3.1L V6 Lumina that would lose AF as well. Maybe your intake manifold gasket or head gasket are going bad. If there is unusual stuff on the oil fil cap or dipstick you have a gasket leak.
have system pressure tested to observe leak
Upper intake manifold plenum leak/crack most likely. If its blowing out coolant then you probably have a bad head gasket.
most likely heater core leaking
Dexcool is recommended.
Pentosin Type G12.
green
For a 1989 lumina, it's about 6.25 inches from the ground to the lowest part on the car.
add to coolant recovery tank!!!
A 50/50 mix of water and antifreeze
If the pump is leaking or noisy then assume it is failing.