How we all feeling guys?

Okay I'm at a loss and need some serious help. I've got a 1989 Iroc-Z L98 with the 2.73 rear end. It's been a great car overall but i've suffered with comfort of all kinds over the last 8 years that I've had it. Living in AUS the car has been hacked up and glued, rather badly, back together as a result of moving the steering wheel to the right hand side of the car.

Anyway, the problem...
My HVAC controls generally do not work too well. I've just pulled the whole centre console out to try and help get to the vacuum tubes etc. I'll see about getting some pics at a later stage.

My temp control doesn't seem to get the heat very well, I had found the GRAY vacuum tube was cut and I've since reconnected that. Seems to have helped but its not consistent.

My main problem is the RED vacuum tube. I do not know where it is at all. I know where it's supposed to connect to at the switch but the line itself is nowhere to be seen. Where does this line normally go to? If I can find the other end maybe, just maybe I can reconnect it. Without it the AC is almost useless as 99% of the cold air is blow on the windscreen and in 104+ F temperatures with all the glass it's practically useless.

Any kind of help would be appreciated.

Cheers Guys!

 

Sorry I don't have a better pic to tell you exactly which hose goes where
so hope this one helps.
There should be a vacuum line that runs from the engine to the
heater/ac contoller.


As far as the temp control it is NOT part of the vacuum lines!
It is controlled by a seperate cable that opens and closes the temp/mix
control door. You should be able to hear it open and close when you
move the temp contol lever.

 

Cheers for the reply.
My unit might be a newer model to that one.

My controls looks more like the one attached. As you can see the grey and purple are attached to a second rotary vacuum switch which is controlled by the temp lever. My heater tap is a manual level/cable operated one and that works just fine so I'm not sure what the vacuum tube is actually for...
Where abouts is the temp/mix door? Can I feel it to see if it is moving?


In case this helps anyone else I have this vacuum diagram too:



The selector switch on the right appears to be working on mine except the red tube is cut at the connector. I'm looking for the other end of it...i'm assuming its somewhere in the dash?

 

Okay I've found a bit more information...

so it's the RED diaphragm i'm after. If the hose is missing i can hopefully install my own. So the question is, where exactly is that and whats the easiest way to get to it?

In case other people are after more information i have found the following also:
- Vent doors (shows the vents/ducting)
- vacuum actuators (not sure what this is exactly) but it looks useful

 

I'll venture to say you need to pull the entire upper dash assembly if you want to play with the vacuum actuators and the vacuum lines from source to terminus.

 

I don't see where the line is cut.
Edit - sorry - I just read that it is not your controls - just a reference pic.

 

To get to the red your gonna have to take the box out. Im almost 100% positive on that

 

Thanks for the tips guys...

Here is a picture from when the dash was pulled to replace my heater core. The red circle I believe is where the red vacuum line is supposed to go. I wish the damn guy that replaced my core had found this!



Second image might be a bit clearer...

Does anybody know if the front dash asembly can be taken out without removing the cluster?

I'm scared to pull the entire dash like this because I'll never get it back together again...and it will most likely fall apart.


On a side note when i had the core replaced the replacement part I had ordered was nearly 2x the size and would never fit. Cost me over $400 to have the original rebuilt

Original one was: https://www.thirdgen.org/forums/atta...1&d=1364255254


VISTA-PRO Part # 399083 {#9083}
W/AC; W/O AC-HEATER ONLY

 

okay a little more progress, but i feel like its one step forward and 5 steps back.

i found a post that gave me a little pointer on its supposed location

https://www.thirdgen.org/forums/cool...plete-yes.html
So i stuck my head down on the now passenger side to take a look. Maybe someone can help me figure out what I'm looking at.

This first picture is the two vacuum diaphragms right near the footwell on the drivers side of the car. Just to give you context..The weird on the left of the image is a torch
https://www.thirdgen.org/forums/atta...1&d=1364376967

The second picture, this is a little hard to see...on the right side you can see one of the vacuum diaphragms. Looking down the cavity you can see behind the large HVAC box that hosts all the doors etc.
If you look carefully, where I've circled you can see a little silver thing sticking out.
This is a screw of some kind. Is this where the vacuum diaphragm/actuator is supposed to be?



If someone is able to crawl into the footwell of their car and take a snap for me I'd be most appreciative.

 

I've also come across a post where vader metntions getting access to this door from the top of the dash.

https://www.thirdgen.org/forums/tech...-switch-c.html
If anyone has any clue on how this is done it'd love to know. If i can't fix the actual problem maybe I can stick it on that mode permanently.

 

So, what you're basically saying is that the vacuum solenoid on the back of the box is missing as well as the hose? I happen to have a dead housing with good motors on it if you would be interested. Not sure how shipping to Australia would be, though.

You're going to need to remove the box. The only way to install the motor is with the box out or at least accessible enough to get the front half off so you can secure the motor to the box and hook it up.

 

It appears as though the solonoid and hose is missing, however unless someone is kind enough to crawl under their car and confirm it for me I'm not game enough to say yes 100%. This being the only Camaro I've ever played with I can't talk from experience.

Also if that is missing am I missing anything from inside the box? This is my actual car and you can see inside the box. I could be wrong but I think the circled point is the 'screw' im seeing on the back.


Thanks for the offer but shipping I expect would be way too much. I think if I'm actually missing the parts I'm just going to have to let it go...the joys of owning a hacked up car.

 

Jeez dude- I think my heater core cost me $20 here in California. You should have hit this board and called for help instead of plonking down $400AU for a rebuild...! I'm having issues with vacuum lines too. I may be pulling my dash out and will let you know what I find. Good luck, cobba!

 

cheers mick. Problem back then was that it was at the mechanics and he wasn't going to be happy about having my car sitting their unusable while i try and figure out the core replacement.

Small update and i think the point where I'm going to concede defeat...
I took off the ducting for the front vents to help me look around and this is what i found.


Hard to believe the quality of workman ship. I mean if you're $h!t at your job that's one thing but to just cut a hole in something for no reason at all...

Anyway I patched it up rather badly with a lot of glue and a metal plate.
Now there's always air going through the defrost vents but it seems like enough air is getting through the front vents to make it liveable.

Hopefully this thread will help others It's got the most information/diagrams I could find on the whole ducting/vacuum system.