My AC Only Blows Out of the Defrost

[Sam Byrns]

I am just starting out to repair the AC on a van I bought from a neighbor and the air conditioning only blows out of the defrost and a little bit out of the floor. The system is charged, the blower fan works on all of the speeds, I just don't know where to start and the internet has nothing that will do me any good for my specific vehicle, which is a 1999 GMC Savana 3500. I was just curious how to resolve this quickly and in the cheapest way possible before I tore apart the dash and got in over my head. Any tips would be greatly appreciated. Thanks.

Edited November 2, 2020 by Sam Byrns
I resolved my previous problem.

[Duelin]

Check the Vacuum Reservoir and hose going to the A/C vacuum control switch. When it blows out the defrost vent that is the default mode. And is usually cause by a vacuum leak.

[Sam Byrns]

Cool, where exactly is it? I checked around and some people are saying under the battery and others are saying the passenger fender. The engine bay is quite cramped so I am trying to go by feeling around for hoses but have found nothing yet.