Just was playing with Thermoststs and E- fans last night on a new engine install. I shut off the engine, I left the E fans running. As the engine spiked about 15 degrees ( about 3 minutes after shutoff) I started it back up for about 5 seconds. The much cooler fan from the radiator was pumped into the Motor. Temp came down imediatley. I think this will be my shut down ritual in the future.