Helping a neighbor with his A/C on his Zetec Tour. I've never had to work on a Zetec before, so thats what brings me here.

When he is driving on a level grade the A/C works fine, but when he hits any uphill, the A/C cuts out/ stops working. We found a vaccum line that appears to be coming off of the trans (auto) and the other end has come apart from its home. We can't find a home for it and it feels like it is sucking. It's a flexible rubber hose, with a right angle end that is loose.
The 2 may be related, or may be totally separate, I am guessing. I may be able to get a pic if it will help.
Thanks!