97 ford taurus overheating. why?

when my car is idling the temp gauge will start to rise all the way to red but then when either i rev the engine to about 2,000rpm or am driving on the highway the engine temp gauge will return to a normal tempature when the gauge gets about half way up the cooling fans kick on. Also i dont know if this has anything to do with the problem but i dont get any heat into the cabin through the vents even when the heat is one but rather alot of cold air
 
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