heat A/C vacuum diagram

[willys_truck]

hey guys I have a problem with my heat /A/C vacuum lines. My heater valve does not have a vacuum line hooked to it. Is the heater valve open or closed with no vacuum? Also, I only get air to the feet, i cannot get air blowing through the vents. Does anyone have a diagram of what hooks where? thanks

 

[fodoimp]

I dont have a diagram but I know on my car the white vacuum line that comes out from underneath the heater box is the one that goes to the valve. I am not sure if it is opened or closed with vacuum but if I had to assume I would think the when the valve receives vacuum it is opened. You should have a vacuum canister that has a purple line going to it and a black line that comes off and goes to the engine vacuum source. Not 100% sure mine is the way it came from the factory because I am the 4th owner but I know it works!
alot of the time the heater control is to blame for malfunctioning. The vacuum leaks at the back of the switch and usually has to be replaced.

 

[azmalibuwagon]

I found this one for the 77 Corvette. It's not exactly like my Malibu, but I was able to use it to fix my vacuum problem. Hope it helps.

http://home.comcast.net/~chadwick.rober ... vacuum.pdf

 

[willys_truck]

Thanks guys , I got it working. I hooked the violet line to a good vacuum, then I hooked the white line to the heater valve. Still nothing, so I looked behind the glove box, when I move the temp control from hot to cold, the flapper does not move. I closed the heater flapper by hand and everything started working right. So, now i just have to figure out why the temp. control is not moving the flapper like its suppose to. I think that the keeper that holds the cable broke or somthing like that.