Once the radiator is installed, be sure to check for electrolysis from a poor chassis or radiator core support ground. The electrolysis will eat the aluminum up in short order. One telltale sign is a black anodized look inside the radiator tanks. When you service your cooling system, the electrolysis check should be performed. If you find electrolysis, and you've been running the engine like this for awhile, fix the problem and change the antifreeze.
Use aluminum fittings in aluminum radiators, if possible. Using dissimilar metals together can also cause electrolysis and corrosion. A light coating of Teflon sealer on fitting threads is a good idea for ease of removal later. No need to use the longest wrench in the toolbox to install the fittings either. Use restraint when tightening the drain plug or drain cock.
We dropped our Dewitts radiator and core support into PSA and filled it with a 50/50 mix of Prestone antifreeze and distilled water, then hit the road to catch up with the '05 Hot Rod Power Tour. During the trip, the cooling fans would come on at 215 degrees, run for a short time, and the temperature would quickly drop to 197 degrees. We ran the A/C through all the typical traffic associated with the Hot Rod Power Tour and never saw the temperature above 215 degrees. Out on the road, 200 degrees was the norm, no matter what terrain we encountered. since that time, the cooling system has continued to perform flawlessly, and if we ever need to service the radiator, the original engine-driven fan shroud is not a concern.
PSA had logged over 10,000 miles in seven months when we decided to take the cover off the top of the radiator and found quite a bit of debris had accumulated in front of the radiator. There had been no noticeable temperature change, but eventually, the accumulation of debris would be noticed. It's a good idea to annually inspect the area between the radiator and A/C condenser for debris.
Fuel mileage is our big concern now. The Dewitts aluminum radiator can actually save some dollars in fuel costs. If the electric cooling fans are controlled properly, the stable engine temperature will allow optimum fuel usage, and if the fans aren't running all the time, the alternator load will be reduced, thus using less horsepower, which means more fuel mileage. Even engine-driven fans will benefit if a thermostatic fan clutch is used. Lower temperatures will require less thermostatic fan clutch engagement, requiring less fuel usage. What a deal-save your engine and better fuel mileage to boot!