A/C AND MAIN VENTS????(IMPORTANT PLEASE HELP)

my friend just fiberglassed a new blower in the stock blower box and it wont come out of the main vents in the dash,it blows out of the defrosters and floor board really good and cold but not out of the vents,dose anybody have a digram of the flow system of the a/c after the blower.I think it might be something blockin the pathway for the main vents.i checked the a/c pannel and looked for disconnected vacume lines and cant find anything.please help A.S.A.P!!!!!!!!!!!!!!!!!!

Most boxes have 3 different blower settings floor defrost and in your face. Some are cable pulled others are done by vacum. Dont know what car you are working on but it sounds like the control isnt hooked up right.

my f-150 does the same thing. i dont know whats wrong?

its a 1997 isuzu hombre its the green one

bump,come on guys help us out.i know somebody has 2 know something

bump