Can't switch vents

[buddhaman]

'04 with manual climate control. So from what I've read there's an issue with not being able to switch to dash vents due to vacuum loss. I can't switch to anything but my dash vents or off. I've replaced the HVAC control panel as well as just the selector switch. When I use a jumper from the main vac port to the defrost or floor vents it switches over fine. I haven't found anything like this in the search but if there's something I missed, I apologize. Any ideas on what the issue may be?

 

[mbtech2003]

Check by the battery. There is a host of vacuum lines that can be broken. Or a bad check valve. The vacuum Reservoir is built into the back of the battery tray if I remember correctly

 

[Vincent Vega]

mbtech is correct. Something came unplugged, could be the check valve but more often is the vacuum supply line that goes into the firewall just forward of the glove compartment. this happened to me when I accidentally ripped that vacuum line out of the firewall as I was removing the RH valve cover. The firewall connection consists of a single grommet with a white and a black vacuum line. The white goes to your hot water controller. I made a video on this that I never got around to editing and posting, but I installed a new vacuum line from the check valve, ran it over the throttle body and then through an unused grommet in the firewall on the driver side (under the vacuum booster), and into the junction of vacuum lines just forward of the console (black vacuum line). So basically I bypassed the firewall connection because re-establishing that would require removing the dashboard, which is a huge job. Not sure if what I said makes sense. Hit me up if I can clarify or send you photos or whatever you need.

 

[buddhaman]

I'll check that out this weekend, thanks y'all. Would a broken line on the engine side be cancelled out by using a jumper at the plug connected to the switch?