hi everyone glad to join.
Long time olds owner.
1st car 1972 cutlass supreme 4 door yellow with black vinyl roof
1975 delta 88
1978 delta 88 coupe
anyway, my dad gives me this 1999 cutlass 3.1 for my daughter.
he got it from and old lady, hummm.
owned it 6months with 140k miles
started overheating and losing anti freeze
changed water pump and thermostat
flushed radiator
car will idle, for 1 hour temp is fine.
daughter takes it out and overheats
a lot of post point to head/intake manifold gaskets.
i too old for this s#$%
any other possibilities?
thanks

 

I assume the fans run when they should...
If you are loosing coolant, I'd think head gaskets also. Pull the spark plugs and see if they are all the same color, if not you may have found the cylinder where the leak is.
If you are not loosing coolant, you may have a bad thermostat (even though you changed it) or a bad radiator cap.