Our old Ford has dual fans and they are great. The first is operated by a Flex-a-lite variable speed controller. The second comes on with a regular thermostat and/or AC override. Both can be turned on manually as well. I also run a "delay off" timer set for 15 seconds.
They are really, really great in the heat!!

Pic of the Flex-a-lite controller mounted on the front of my extra relay box:
[Linked Image]

To the right on the box are the bleed diodes for the fans.
I know ... overkill.

Last edited by CatFish; February 20th 2019 1:56 pm.