My camry started to over heat in idle. Ive heard several thing it could be like the water pump or the thermostat, I think the cooling fan isn't coming on when it gets hot it used to work I mean cool down when iturned on the AC but now that doesn't even work so im out here in phoenix az summer with heater blowing and that ant no fun.

 

4-cylinder or V6 engine?

 

Radiator may need cleaning. Also check your head gasket for cracks.