2005 super duty Harley addition 4x4 problem
So I live up in maine and we just got our first dusting of snow for the season and i went to put my truck in 4x4 and the light on the dash lights up but it deft not in 4x4. The hubs are auto lockers so i switched them to lock instead of auto and the same thing nothing. But i did hear a clanking rattling noise sounding like it was comming from the driver side wheel. What could be causing it to not lock in 4x4? is the hub bad? what should I look for iv never had a truck with switch for 4x4 or auto hubs.
Also I cant change the location of the heater it always blows defrost so i cant change it to vent or floor or any of that only blows out defrost towards window. Is the 4x4 switch vacum activated? if so i could have a vacum leak not allowing me to change that as well as not hookin 4x4.
any advice would be great it sure sucks driving in 2 wheel drive thanks