my 2001 chevy malibu overheats,changed the thermostat,sensor and coolant...

[RichardS]

...container,still overheats why? and now both of my fans aren't working.

 

[david b]

try back flushing the cooling system, could be alot of sediment in there

 

[gus]

bad head gaskets. you need to do a head gasket test to see if you need to replace them.

 

[grimrpr6942]

could be a few different things or a combination there of, could be air trapped in the system, fan relay is bad, fan fuse(s) are bad, thermostat in backwards. if the fans dont work, i would check the the fan relay and fuses first.

 

[Ken E]

If both your fans are not working it will keep on overheating. This could damage your engine like warp the heads and blow the head gasket etc.
Try this: turn the air conditioner on max air. If the fans now come on this means your fan relay is bad. When you turn the A/C on this bypasses the regular fan relay. The relay will be out of sight probably like under a piece of plastic near the radiator.