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No coolant, just baffling for the front crankcase vent. That plate closes the chamber off so the baffling works. Reason they put a plate there is they can't cast that baffled void into the block with a closed end.
Think of that chamber as an internal "catch can" or blow-by separator. It's not very effective, as many people have seen plenty of oil in the intake tract, particularly with FI. Leaving it open just makes it even less effective. Doesn't hurt anything.
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There are many ways to displace.
-Spartarus
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