There is a class action law suit pending against the dexcool, orange antifreeze. If air enters the system it will cause it to congeal.
The orange color.
At present there is a class action suit against Dexcool. So use the green antifreeze.
It calls for dex-cool.
Dexcool
The Chevrolet Aveo, according to manufacturer's recommendations, should only use Chevy Aveo 2007-2011, Coolant and Antifreeze by Genuine®. 1 Gallon, in Orange. You can find it online or in most auto parts stores such as AutoZone.
dex-cool only
It should be disc on the front and drums on the rear.
In all probability the alternator is not working as it should.
It is no longer necessary to add just water to a radiator in newer cars like the 2005 Malibu. An antifreeze that is half water and half antifreeze is usually best. Add the 50/50 antifreeze to the radiator overflow tank. It should be a plastic, see through tank hooked to the radiator.
It should be just below the bottom radiator hose.
a 50/50 mixture of correct antifreeze and water, or the already premixed antifreeze. Use ONLY coolant that is designed for GM cars. Do NOT use the green colored or tinted antifreeze since this will gunk up your system and cause real problems like overheating or thermostat issues. I think the correct tint of the antifreeze should be orange, pink, or clear.
They should be changed only if they are cracked. That is why it is important to never let it run hot.