My 2008 Dodge Nitro is still overheating after I replace thermostat and waterpum

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My Nitro still over heating after I replaced the Waterpump and Thermostat..?? Also I checked oil dipstick too no sign of yellow/orange sludge..But when I parked it when overheated the coolant antifreeze level is stil the same doesn't seem to be going down..Also notice the Rad Fan ain't spinning when u first start the vehicle ?? Hmmmm help ??