These fan switch kits are what we use in our aluminum radiators. 190°F-on/175°F-off electric fan control kit includes the 1/8" NPT threaded switch, 1/8" x 3/8" NPT adapter bushing and a relay wire harness to make it an easy installation. Maximum capacity on this kit is 25 amps.
Eurowise single-stage fan controllers can be installed in the side of the Eurowise aluminum radiator. They activate fans at a specific temperature and turn them off at a preset temperature. The controllers are available for single or dual fans.