Remote oil cooler. Which direction should fan blow?

I installed one of those 72 plate oil cooler & fan kits on my Type 3. I located it on the horizontal surface above the transmission. The oil cooler is offset
from the surface by about 2.5 inches; the fan hangs from the cooler. The fan has a maximum of 570 CFM.
The fan can be run as a pusher or puller by simply disassembling the fan and reversing the fan blade assembly. My question is: should the fan pull the air down from the cooler, or push it up through the cooler?
If the fan pushes the air from the bottom up, cold air is drawn from below but the hot air that is expelled from the cooler ends up in the 2.5 inch space between the cooler and the horizontal surface of the underbody. Then that hot air travels rearward toward the engine. And in a Type 3, the engine has a lid above it to separate the engine from the luggage compartment, so the lid is already holding a lot of heat in against the engine. The engine lid and the horizontal surface are on the same level.
If the fan pulls the air down from the cooler, warm air from above the cooler is pulled through the cooler and the hot air is expelled downward. Then that hot air travels rearward toward the engine, though in this case a bit farther away from the horizontal surface.
Which method will give the better results? An unknown factor is how quickly the air above the transmission gets moved along when the car is at speed.
________ ____________ /[cooler] | | ------/ [fan] |_________| floorpan__________|seat/ trans engine
Randall
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Sounds exactly like my setup. PULL the air. The hot air going back toward the engine will be highly 'diluted'.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.