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1976 280Z vacuum selector valve


Z Excellence

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When I select vent on panel the heat comes on. All vacuum lines have been replaced. I have traced the problem to under the dash heat/control panel. When I touch the vacuum selector valve it will cause other AC/ defrost / heat doors to open. Is there anybody that has one of these valves? Can’t find one anywhere. Thanks, Tracy

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Looks to me like the valve has the hose connection locations cast in to the back.  I would use those instead of the drawing if they don't match.  Looks like one your D hoses is switched with another spot, it's on the "I" position.  Don't lose those pieces of tape.

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24 minutes ago, Zed Head said:

Looks to me like the valve has the hose connection locations cast in to the back.  I would use those instead of the drawing if they don't match.  Looks like one your D hoses is switched with another spot, it's on the "I" position.  Don't lose those pieces of tape.

image.png

Thanks I will check that out. I see what you are talking about. 

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No comprendo.  Seriously.  Don't know.  When the label is right at the end of the hose, how can it not go there?  Can't hurt to switch them.  There is a lot of stuff in that AC chapter.  I think the 76 FSM chapter might be in better shape than 75.

This part here is odd also, below.  Not sure what it means.  Touch.

8 hours ago, Z Excellence said:

When I touch the vacuum selector valve it will cause other AC/ defrost / heat doors to open.

 

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When I pulled out the center console and with one hand I would touch the vacuum selector Lightly with my finger While vent was selected  it would cause air to come out different areas. For instance vent was selected but touching the vacuum selector made air come out of heater doors. I’m also puzzled by the shop manual has different stamping on the selector than my car. I’m the original owner. I was in Houston Tx so I had to put the console back in to drive it home. I agree with you that I should follow the stamping on the valve, not the shop manual. AC and defrost work perfectly. Thanks for your input and help. 

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The D1 and " I " looks like they are interchanged. I'm going to look at mine and mark them with my label maker. This is something else I have never seen. 

I will check mine out tomorrow and take a photo.

Ron

Edited by zclocks
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33 minutes ago, Z Excellence said:

When I pulled out the center console and with one hand I would touch the vacuum selector Lightly with my finger While vent was selected  it would cause air to come out different areas. 

I used to know somebody that was convinced that their body was magnetized because their watch battery died often.  Kidding!!  (Actually I did know somebody that told me that).

I don't know how a touch could cause a mechanical valve to switch like that.  Who knows.  I know that the flappers have a spring that has to be overcome by the force of the vacuum.  Maybe yours were right on edge.  Brushed a hose or something.  I notice that those nipples and hoses seem to be of different diameter, so if they're switched one would be loose and one tight.

These cars are like Alice's rabbit hole.  Always more to explore.  That sounds awkward...

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14 hours ago, zclocks said:

Good catch Zed...

 

I have a 75 and this is what the manuals says . The "T" in the vacuum line  should be connected to the D1 on the vac switch , but is connected to I.

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That is exactly how mine is connected. I is connected to D1.  1976 280Z manufactured 9/1975. 

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1 hour ago, zclocks said:

I did get a photo after mega contortions, but my 75( 1/75) is connected as per the manual.  D1 hose to D1 on valve  and "I "hose to " I "on valve. "T" connection is from D1

 

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Thanks for your time in doing that to help me. It was super hard to get down there twisted to even take the picture I know. I’m 66 and once I got down there it was hard to get out!!!

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