So I got a EATC from a friend, that is confirmed working. With it installed, I still only have defrost.

I did find the vacuum feed line that runs up by the cowl and no leaks in it that I can see. I unhooked it from the coupler right near the suspension air pump and hooked the mityvac to the line going towards the interior. I was unable to hold a vacuum at all and heard a hiss from around where the line goes into the cowl. My question is, with the car off, should this line hold vacuum?