I have two questions regarding the vacuum lines on my 81.

I have completely redone the A/C and Heater. Now I'm putting it all back together.

I get ready to hook up the vacuum lines and lo and behold.....I discover what I believe to be inconsistencies in the AIM that I need help with.

1. Here is what one AIM diagram says my water shut off switch should look like:


Shot at 2012-04-07

Here is another shot of how it should look on a different page:


Shot at 2012-04-07

Naturally, I discovered this after I had replaced the lines:


Shot at 2012-04-07

Which side does the white stripe go on, and which side does the black go on? The diagram says the white goes to the right as in the picture above, but I'm not sure now.



2.
This is how the vacuum lines were attached to my control unit:

Shot at 2012-04-07

This is how part of the AIM shows them connected:

Shot at 2012-04-07

However, when you go to look at the chart to actually connect the vacuum lines......it is nothing like the diagram. It shows that the closed off line is actually a port....PLEASE HELP.......



Shot at 2012-04-07


Shot at 2012-04-07

 

ttt

 

The AIM picture is looking from the top of the switch, the switch picture is looking from the bottom.

 

Your switch is lying atop the AIM page which lists the hose color codes and shows the connections.

 

I want to make sure I have this right. So if I'm looking from the bottom of the switch, even though it doesn't resemble the diagram at all, this is how it should be?



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IMO

 

Hope my last reply helps you

 

I know I'm beating a dead horse with this. I want to make sure I get it right the first time. BEFORE I install my new dash.

I believe I've got it now. I want to thank you all for assisting me.

I was totally looking at this wrong. One of those goofy things that can't be explained.

I was looking at it as if the top was the top, and turning it upside down was the bottom. Not just rotating it.




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I may be mistaken but I think you are 1 port off on this.
By looking at your pic from left to right. Black Hose. White Stripe hose then the open port.

 

The valve has 3 ports. As your AIM shows, the white stripe hose attaches to the middle port. The black hose attaches to the port closest to the firewall. The port closest to your passenger's seat remains open. Your photo shows the hoses are not correctly attached.

 

I will tell you that I'm concerned about this for a simple reason.

It wasn't done like that at the factory.

When I get home tonight I'll post a picture of the rubber boot used to attach those two lines. It is just like the boot above used to attach the four lines to the controller

Originally, the port on the far left is, slightly lower than the other two, is a dummy. In fact, it was left open by design.

It totally contradicts the AIM.

From the factory the white stripe was on the right, the black in the middle and the far left one is left open, but the rubber boot has a guide ring around it.

 

Your vacuum control valve is very different - and, I hope, better - than the valve in my '78. The internal design must have changed completely as the hoses on my valve connect as shown in your AIM. The only valve I can find that looks comparable the valve in your '81 is this photo:



The hoses appear to be connected to the same ports as your photo shows in your original posting, but it looks like the white stripe hose is connected to the center port and goes toward the firewall grommet.

How to test?

This discussion assumes that your white stripe hose is connected to the water shut-off valve in the hot water hose for your heater core.

With the vacuum control valve plunger fully depressed, put one of the vacuum hoses to your lips and blow into it. You should feel your breath exiting through the other vacuum hose. This means vacuum will be ported to the hot water shut-off valve in your heater hose when the temp control lever on your console control is set to full "Cold". The hot water valve must have this vacuum to close off water flow through your heater core.

With the plunger released, you should not be able to blow air through the black hose; but you should be able to blow through the white strip hose and your breath should exit through the "dummy" port. If this is not the case, you need to switch your hose connections on the vacuum valve and test again.

Adjustment?

There is a turnbuckle in the temperature control cable that changes where the vacuum control valve contact paddle (#3 in the above photo) is positioned when your Temp control is at "Cold". Make SURE that paddle fully depresses the plunger on the vacuum valve when your Temp control is "Cold". (The turnbuckle looks similar to an in-line fuse holder for a glass electrical fuse.)

I hope this helps...

 

I hope this helps...[/QUOTE]


WOW......that is exactly what I needed. You are 100% correct. I ran the tests and set the cable.

PERFECT operation.

I knew there had to be some smart guy here, and I wasn't wrong.

thank you so much for this, I can sleep again!!!!!

The white stripe definitely goes in middle, and the black to the right. NOT like the AIM.