I have a 2007 Mack CXN613 with the AC-460 @ 480 HP. I live in the California mountains and having the fan override switch would be very helpful. Went to local dealer said no can do on an override switch. My question is why couldn't I splice into the AC high pressure switch and override that way. On the old mechanical engines wouldn't be a problem. Now with everything going thru the ECM don't want to screw that up with an improper switch install. If anyone has installed an override switch on one of these engines would sure like to hear from you. Thanks Cosmo
