Best Way To Cool A Cake. If you intend to fill the cake with frosting or a tasty filling you will be cutting the cake anyway- why not cut it now. Not only that but also it is the easiest method.
Cool cake layers in pans on wire coolingracks for 10 minutes. Put the cake in the refrigerator overnight to cool. Depending on the size I can usually start to ice it in less than 30 minutes.
A word of caution.
Removing the pan is a key component in cooling down a Bundt cake as metal pans tend to retain the heat from the oven very well and when the pan is right next to the cake that is. Once the cake is sufficiently chilled you can trim the layers stack and fill the cake and apply a crumb coat which is a thin layer of frosting that covers the sides and top of the cakeThen stick the whole cake back in the refrigerator for another 10 to 15 minutes. Wrapping a warm cake layer will lead to messy condensation so wait until it is completely cool before applying plastic wrap. Use the Fridge or Freezer.