3 Reasons Not to Cool a Hot Cast Iron Pan in a Cooler

Heat can damage the cooler The interior plastic of a cooler can warp or melt when exposed to direct heat from a screaming-hot pan.

Thermal shock may crack the pan The sudden temperature difference between the hot pan and the cold cooler can cause the cast iron to crack.

Trapped moisture causes rust Steam trapped inside the cooler will condense on the pan, leading to rust, while the cooler itself just gets hot instead of cooling the pan efficiently.