the system is probably out of coolant.
Stalling at idle? Immediately after starting? While driving? While stopping? Cold or hot engine? What engine do you have?
check heater fan to see if it is working.
Look on the side of the coolant overflow bottle. There should be a low mark for the coolant for a cool engine, and one for a hot engine.
5W30 weight in the winter months and 10W30 in the hot months.
A sticky brake caliper could do that.
The Malibu might have a problem with the vapor canister. If the canister is clogged up the fuel tank will not vent right and the car will be hard to start.
Battery is run down or on it's way out.
Did u check your enigine cooling fan?
They should be changed only if they are cracked. That is why it is important to never let it run hot.
Very likely.
There is a leak in the rear lines running to the back.