That would be great so you had the same issue i take it to? Are you unsure where that pesky black hose goes too? This sucks suppose to be going to MN next week however if that black hose is disconnected like mine was youll hear the vacuum underneath the dash when the engines running that's how i knew it was leaking plus i lost brake booster power on the ABS braking everything was fine for me until i ran wires up there as well if it helps i ended up finding the black hose behind the plastic tubing for the small vent that runs underneath the steering wheel however i had the paneling underneath the stereo removed (like the one you have in your picture with the torque bolt thst panel had to be off to access the black hose) and it wasnt hooked up the end looked like a (clear)suction cup thingy :-)

 

Well I don't have any issues related to noise or brake booster control loss. The only thing I have is a very quiet hiss when I turn off my blazer, but I always thought that was just old HVAC lines.

 

Well if yours is disconnected stick your head up underneath the dash with the engine running and mess with your ac/heater controls youll hear it trust me however if its not leaking find that black hose for me with a elbow bend and a clear end PLEASE it should be within the area of where you took your picture its not very long probably have to put your hand up there carefully to feel around

 

Yeah, I'll poke around today to see what I can find for you. And see if I find some more problems with Tigger.

 

heres what i have come up with lower mode actuator but looks like its behind a panel im not sure tho its hard to tell in the picture i dont know how to remove :-( only thing i can think of cause the only hose colors in that area i know of are the brown and the black one but not sure what that would cause to malfunction on my heater and a/c controls

 

Now that I think about it, I don't think my floor vents have ever worked. That could be why.

 

lower mode actuator is what i have circled but the thing is in the picture it kind of looks like that hole that it plugs in through to and hooks up to the top of the actuator if you decide to get it into it please supply me some pictures so i can see how you was able to remove and access this thing would you for me please however good luck to you with this one and hopefully tigger is alive and doing fine :-)

 

I'll be sure to let you know how to get in there. Tigger is running fine, but it seems like I find something else to replace/fix every time I look at it. Oh well, that's life with a blazer I think.

 

well lol it all depends like for example mine was perfect interior until i decided to tear into the dash to change the stupid stereo and add the overhead tv screen but had to have it now i create a problem lol a/c vacuum lines actuators worst thing for me with a car i dont understand how it all completly works or is even hooked up so i try to stay away from that stuff for 51000 on the dash i still kick myself in the butt beings its the customkraft addition i bought it 2 years ago 2 owner vehicle had 38000 on it and well i always wanted the stereo but never had the guts to tear into the dash was always affraid of messing something up but your right in the long run its a blazer cheers LOL

 

Well I took the bottom part of the dash off to try to look at it and found that it would require a lot of time to get into where that hose is. I tried to feel around and I couldn't find any vac line back there. I found that my floor vents do blow air, it just isn't very strong.
I can hear a hissing sound when I turn on the heater, but not with any other setting. It's pretty easy to get this ^ far, but getting to where you could actually see the small white piece would be a major PITA.

I wish you luck, as I would not want to have to pull everything out to find the problem.