Thanks guys, I do have the lip on the outside and the correct drain & tube leading to the engine side of the firewall (should have mentioned this in my first post)

My question was about the rain water when the vent is open. Looks like from your answers I just hve to keep it shut.

Just seemed odd that the origional design could allow potential damage to the wiring for what seems such a simple thing as leaving the vent open.


1941 Chevy Master 3/4-Ton
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