Wow, that is hot. I’d start by checking the ducting looking for what could be directing the heat to the kitchen cabinet. Sounds awfully hot for just a misrouted duct, but that’s where I’d start looking. Since it’s an ‘18 a visit to the dealer would be another suggestion.
Good luck and report back what is causing this problem.
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks