The air has stoped blowing out of the vents, it still blows out of the defrost vent but not all the others. Can someone tell me why this is and how I can fix it?

The air has stoped blowing out of the vents, it still blows out of the defrost vent but not all the others. Can someone tell me why this is and how I can fix it?

Probably a vacumm leak...

What year ?

Have you made any modifications to the truck recently, hence accidentily disconnecting a vacume line ???? IF you did retrace your steps and mybe you will discover a loose/disconnected hose...

Otherwise ..... :confused:

Its 1995 blazer