2001 Blazer 4x4. Standing at the front of the vehicle looking at the engine there are two hoses for the air conditioner that drape across the fan shroud. What is the outer hose for? Following it it goes beneath the radiator Where is the air pump is.

And, yes, I am trying to get my for 4 wheel drive working. From extensive reading I know where everything is but am I willing to go there...haha. Like the actuator coming off the transmission with the three vacuum hoses pert near can't get in there to loosen it up. It's not like number 3 spark plug that only David Blaine can get out, but close.

 

The smaller diameter of those two hoses goes to the condenser in front of the radiator.

 

Damn, I forgot about that part!
NB: 4-wheel drive now works.