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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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  On 10/29/2020 at 9:32 PM, 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.

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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.

  On 10/29/2020 at 3:52 PM, 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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