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It will depend on, if your cooler is "serpentine style" (one tube meandering
back and forth through the cooling fins) or a "tank style" (collector tanks
on both sides and multiple cross tubes).
Serpentine doesn't allow air-cushions (Think shower-hose) No matter if the
water goes up or down the hose, any air is purged out with the flow.
With end-tanks, the flow-speed comes way down in the cooler and may allow
air to ocuppy the upper few cross tubes, reducing the effective cooling area
as the oil goes through the lower tubes.
If you have the "OUT" on top it will push the air out into the engine, no
matter what...
Thomas
Thomas, his oil cooler has the one side tank split in two. Oil enters in the one of the half side tanks and is forced through the first half of the flat tubes to the other end. Than it is returned back to the other half end tank.
The thermostat opens the partition between the both halves at the first side tank, and the oil passes without taking the long path through the flat tubes. I think if there was air trapped, soon or later the oil will purge it out. Most likely the thermostat allows direct bypass of the core?
Buly
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