electric fan

I'm sorry if this question has been asked already. I've looked but cannot find any definitive answer to this question... My 2005 Chevy Tahoe with trailer towing package and increased cooling has 2 electric cooling fans. One is quieter and seems to come on with the a/c and maybe other times...

Alright so I'm a little lost here, i have the E Fan kit from LMC Truck ( https://www.lmctruck.com/icatalog/csd/full.aspx?Page=94 ) along with the adjustable thermostat. Well I'm looking at this damn diagram and its looking back at me smiling cause it does not like me. So I'm asking for...