Is the Fan on the Derale Hyper-Cool # D15660 a Puller or Pusher?  

Question:

Expert Reply:

Hi, great question!

For the Derale Hyper-Cool Remote Engine Oil Cooler Kit # D15660, the included Tornado electric fan is fully reversible. In its factory configuration, the fan is set up as a puller fan, meaning it is mounted on the engine side of the cooler and draws fresh air through the heat exchanger.

If your installation requires it, the fan can be converted to a pusher configuration. To do this properly, you'll need to flip the fan blade upside down on the motor shaft and reverse the polarity of the wiring so the motor spins in the opposite direction. This is an important step because simply reversing the wiring is not enough. The fan blades are designed to move air most efficiently in one direction, so flipping the blade ensures the curved face is oriented correctly and allows the fan to maintain its rated airflow when operating as a pusher.

It's also a good idea to verify that you have enough space available for the cooler and fan assembly in your intended mounting location before ordering. Since this is a remote-mount cooler, checking clearances ahead of time can save a lot of frustration during installation and help ensure you have adequate airflow around the unit for the best cooling performance.

So to recap, if the cooler is mounted with the fan on the outside, the airflow direction will depend on how the fan has been configured. In the factory setup it will pull air through the cooler, but it can be converted to push air through the cooler by flipping the blade and reversing the wiring.

What are you towing or driving when heat builds mountain grades, trails, or traffic?

expert reply by: Heather A

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C. G.

6/9/2026

Ok thanks for the detailed explanation. I'm towing a 24ft travel trailer that weighs approximately 5200 lbs (not including cargo and passengers) with my 2012 F150 3.5 EcoBoost. It does fine in flat and occasional hills. But during a long 30 ro 45 minute mountain climb the engine temperature starts to climb. At higher RPMs the twin turbos generate excessive heat. Super heated oil coming back from the turbos is circulated back into the engine Therefore creating cooling problems. I'm hoping this oil cooler will solve the problem. I'll know in a few weeks.

Heather A.

6/9/2026

@CG That makes a lot of sense, and honestly, your application is exactly the kind of situation where an auxiliary oil cooler can help. The 3.5L EcoBoost is a strong towing engine, but sustained mountain climbs can generate a tremendous amount of heat, especially when the turbos are working hard for 30 to 45 minutes at a time. I'd be interested to hear how it performs after your trip. Safe travels, and thanks for following up with the details on your setup!