Get a pair of Bellevue Boots for Vehicle summer or winter. That way hotfoot wont bother you. It's the same boots used by the US Marine Corps except that the Civilian issue purchase have a logo on the heel so you don't get your ### kicked.
Or any quality boot.
Now... if something is blowing heat onto the firewall making you hot where you aint hot before... have a look inside the engine bay to see if anything sprung a leak...