installed a set of e-fans on a 00 silverado with a 4.3l. it has 01 ecu. wired them up just like on my Tahoe and every other gm v8 truck I've done. when the key is on the fans are off like suppose to be. i can command them on and off with logger. when engine is running they are on all the time. i can command them off with logger but they won't go off by there selves.
here is the tune.