I thought I might be in the clear but this AM with about 3 inches of rain I'm back to the same errors, weird blinker skipping, and iDrive screen flicker.

The two wire harnesses that run across the engine were mostly dry, a couple drips of water on them maybe. The connections under the climate filters also pretty dry.

What I did notice is both firewalls are pretty soaked, is this normal? Am I missing a part or something that seals the microfilter housing covers to the windshield?

these:
https://www.realoem.com/bmw/enUS/sho...diagId=64_1569

I'm about to rip out the glove box and see if anything is getting wet back there.

Daytona thank you for your suggestions. I'm almost thinking that water is getting past the firewall somehow like through the boots or something

WontonMH I'll definitely post any progress