I hope these photos help.
I only had occasional problems because 99% of the time it is parked in a shed.
But when I went away, for say a week or two, and it was parked outside, I would get the sloshing if there were consecutive nights of heavy overnight rain.
Back home in the shed, it would gradually die away, I assume through evaporation.
Anyway since doing this the problem has never come back.
And the slight rust around the hole I drilled a few years ago maybe suggests that a bit of moisture passes through it at times.
photo 1 - long shot of engine bay (V8 BMW here)
Photo 2 - stuff removed to allow heater air intake filter housing to be removed
photo 3 - heater air intake filter housing now removed (and sitting on top of radiator)
photo 4 - zooming in on the 6mm hole I drilled a few years ago
Photo 5 - close up of same
Rob
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