My freezer is cooling but it is running too much. I was trying to find a new gasket for it. The model number is MCCF5WBX. Is there anywhere that I can find one?

On all freezers there is an area either below or behind that resembles an automobile RADIATOR....this can become clogged with dust. Try unplugging and moving the appliance away from the wall and accessing either behind or beneath and vacuum-out all dust and debris. Replug or restart the freezer, plugging it in, and see if there is a difference. These types of refridgeration devices require the clear passage of air, circulating thru the cooling filters inside and outside of the freezer. Always have air-circulating around your freezers and fridge.