Lifetime warranty doesn't really cover everything. For manufacturing defects only. It is not possible to get a warranty replacement as the core leaked due to external force. Pretty annoying considering I know Crash people who have replaced them, but if used in a real racing environment Mishimoto won't cover this. I tried soldering it back but the core is so thin it blew out. I thought Mishimoto would redeem the guarantee, especially as I compete in the highest level rally events in North America, but no. I'll get a new cooler, but this time it won't be Mishimoto.