I havent adjusted my fan yet. Im not taking my mech. Fan off either. I dont think its nec. Unless it is removed, thats just my 2 cents though. Correct me if im wrong some1
If you installed a 180 tstat and are adjusting your efan settings to come on at a lower temp, it would be wise (not necessary) to remove the mechanical fan. You'd probably pick up some mpg without the mechanical fan. If you then experience issues with running hot (which you shouldn't ) then you could put it back on.