You need to check the cooling fan relay and the cooling fan switch.
it only turns on when needed.
other then when you turn the ac on then its always on.
The reason the fan runs with the air conditioning is "on" is to keep the high side pressure down. Otherwise it would increase to the point of something blowing out such as a hose or the pop off valve in the compressor. If the check engine light is "on" the it will have a code referring to the problem
Either the switch that tells it when to turn on is bad or the fan itself is bad.
The Chevrolet Malibu radiator drain plug can be found on the right side of the radiator. The drain plug will be at the bottom of the radiator.
Just below the bottom radiator hose is the radiator petcock.jd
Just below the lower radiator hose.
It should be just below the bottom radiator hose.
radiator is in front off the cooling fans ,in the front of engine.
If it is not on the bottom of the radiator, then just remove the lower radiator hose to drain the system.
It is best to have it done professionally as they clean the cooling system as well as back flush it.
It is just below the lower radiator hose.
no cap on3.1, it is on expan sion tank for coolant.
There is a drain plug just below the lower radiator hose.
It is in the housing on the engine that the top radiator hose goes to.