in my books always wire electric fans to switches and a fuse. relays are no good and auto start/stops are no good ither, if it falls out of place and reads cold it keeps your fan off, thus over heating your car. if your relay blows and ur in traffic your screwed as well. iv head of both happining to many times, its not even funny. just take your electric fan and wire it to a switch so you know 100% if its on or off.