Answer:
your fan probily isn't turning on when car is overheating check to see if fans are on if not turn on a/c if they turn on you need a electric fan thermostat if not check fuses and relays if it still dosent work replace fan motor if fans work and car over heats replace thermostat a good way to test a thermostat is to slightly rev the engine if heat goes up the thermostat is bad malibus also need dexcool a special coolant designed by gm its orange you cant use the ceap green stuff hopefully this helps