tj ac vents not blowing

[CAROLINA ROCKRUNNER]

can only get heat and ac to come out of defrost no air coming through ac vents think it may be in switch? need help please

 

[ord.sgt.26NC]

check your vacume lines for a leak.Defrost is sort of like a default setting when the system has no vacum.If it cycled back and forth ,it would be the little one way valve under the hood being trashed.Look behind the battery at the vacum line there.That is where mine broke.

 

[CAROLINA ROCKRUNNER]

?

didnt see any broken vacum lines any other ideas