Engine room heat into passenger cabin

Hi

I remember reading about this but can’t find it any more. Realized a hot air draft after my engine rebuild and was wondering how it got in again. Which holes do I need to check? Apparently due to the lower air pressure in the cabin hot air is flowing into the passenger cabin, if I remember correctly through openings in de sills.

/R

http://www.exiges.com/ubbz/ubbz/ubbthreads.php?ubb=showflat&Number=10327&Searchpage=2&Main=1272&Words=heat&Search=true#Post10327

Great, Thanx!