Built by Derale, stacked-plate coolers are the most efficient and usually smaller, giving you more flexibility during install. When airflow is limited or you need to mount away from the grille, choose a version with a fan so you can place it anywhere and keep temps under control while towing or off-road.
The electric fan is fully reversible. In factory form it's a puller, drawing air through the heat exchanger. To run it as a pusher, flip the fan blade on the motor shaft and reverse wiring polarity so it spins the opposite direction. Verify space for the cooler and fan assembly at your intended location to ensure adequate airflow around the unit.
Choose a cooler size that matches your load and vehicle. A very small cooler made no noticable difference on a full size 1/2ton pickup when towing. For desert, low speed, and high outside temperatures, a stacked plate cooler is the most efficient, and a version with a fan can be mounted where airflow is limited. If mounting without a fan, place it where it sees the most airflow, preferably in front of the radiator.
Start by retourqing to Derale specs and inspect the o-ring. If it weeps, reseal, retighten, and try a new o-ring. Watch hose connections; supplied hose clamps caused slow leaks for some, and higher end hose clamps solved the problem. If a leak returns after a couple of days, recheck the adapter working loose and address the seal at the sandwich plate.
It can reduce engine oil temperatures under load. One setup let a truck tow a fifth wheel RV on the hottest days and in the mountains without overheating. Still watch temps; if they get over 260 f or so, downshift a gear or two to get greater fluid flows. Another reported rarely seeing 115 deg Celsius on a hill and recovering to 100 deg Celsius very quickly after the install.
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