[dr.gonzo!]

After replacing the heater core I only have air coming out of my defrost and floor vents. I thought It was a vacume line so this weekend pulled the dash again to double check and every thing was hooked up. when I was replacing the heater core, there was one black and white vacume line I pulled that was on the passnger side that was hooked to a silver looking canister about 2 in tall just to see what it was and noticed that it was a sucking in air. so I let it hang while I was working on the heater core and it quit sucking air after a while and now there is no vacume at all. I just wonder if I have to hook up some kindof external vacume (like a shop vac with air hose used in fish tanks) to re initiate a vacume in the system or what. I had a post on here earlier but cant find it and it suggested a yellow vacume hose on the drivers side but still towred the middle of the dash. I didnt see a compleatly yellow hose but I did see a black/yellow striped hose and they were all in connecetd. any ideas?

[OTreborO]

89 90 has a yellow hose that goes to the vent that controls the defrost

[craigstoys]

My 89 goes yellow-panel/defrost motor
white-outside air motor
both red and blue go to the floor/panel motor
black is incoming vacuum source the hose going through the firewall between the heater hoses

[terribleonexx88]

isnt it controlled by a thin cable attached to a flapper

[dr.gonzo!]

hey OTreborO. you did say it should be high in the dash in the center but still towred the drivers side right? just to make sure before I pull the dash off for the 3rd time. I really dont pull the hole thing off I drop the steering colum and undo the torq bolts on the uper part just to give me about a foot of room ie.. defrost vents and behind the speaker grill and remove the 2 8mm bolts behind the kick panels. I have seen some bad picks of the plastic part off but they left the metal fram on. looks like a lot of trouble. this is not me. I dont even come close to this disaster.

[/img] im guessing your talking about the yellow vacume line by the radio in the first pic