340 coolant temperature

Do a bit of research on fan shrouds.
Holes in the shroud (with out flaps) defeat the purpose of having a fan shroud which is a plenum where low pressure is created between fans and radiator.

Logically and efficiently designed fan shrouds have either large diameter fans which allow full radiator air flow thru them when they are not on, or have flaps which are one way valves to allow air thru and out when fans are off while allowing a vacuum to be created when fans are on.