1985 classic,A/C vacum problems

[sinasta1]

Ok lets try this a diffrent way.Is there any way to bypass a vacum line a/c,or at least trick it to get the dash vents open.

[TommySS]

Do you have a vacuum leak at the dash control? Are you getting any air from anywhere (defroster/floor/etc)?

[HLandin]

I had a problem where none of my HVAC functions worked from my dash. To it to the repair shop, they determined it was a bad vacuum line, which sounds like what TommySS is talking about. They replaced the vacuum line and it worked fine afterwards.

[kahjdh]

Try turning on the vents then switching back and forth to defrost and etc and listen for a leak.