Ya, you can have one or two come on. I chose two becuase one fan will cool the engine so fast that the second fan wouldn't come on anyway, one fan is sufficient for my app.

the fans do pull the volt gauage down when they come on and it shoots back up , no biggy, but i may have one fan come on at 185 and the other 186 just to cut down on the amount of drain i have when they both come on at the same time.

other than that they work awesome and i would def. recommend it.

i have the 01 z28 pcm but the trucks pcm supports it too.


later,

allen