Z Excellence Posted October 29, 2020 Share #1 Posted October 29, 2020 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 Link to comment Share on other sites More sharing options...
zclocks Posted October 29, 2020 Share #2 Posted October 29, 2020 You might try zKars on this site. He does a lot of work on Zcars and has a big stash of parts. Ron Link to comment Share on other sites More sharing options...
Z Excellence Posted October 29, 2020 Author Share #3 Posted October 29, 2020 36 minutes ago, zclocks said: You might try zKars on this site. He does a lot of work on Zcars and has a big stash of parts. Ron Thanks Ron. I will Link to comment Share on other sites More sharing options...
zKars Posted October 29, 2020 Share #4 Posted October 29, 2020 ZX part I believe. I have pretty much nothing ZX, just 70-78 Z Link to comment Share on other sites More sharing options...
Z Excellence Posted October 29, 2020 Author Share #5 Posted October 29, 2020 No this is 280z with factory air. 1976. The drawing is out of 1976 280Z shop manual. The picture is in my car. Link to comment Share on other sites More sharing options...
Zed Head Posted October 29, 2020 Share #6 Posted October 29, 2020 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. Link to comment Share on other sites More sharing options...
Z Excellence Posted October 29, 2020 Author Share #7 Posted October 29, 2020 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. Thanks I will check that out. I see what you are talking about. Link to comment Share on other sites More sharing options...
zKars Posted October 29, 2020 Share #8 Posted October 29, 2020 aha! Just not something I’ve seen very often. I only have two 280 hvac control setups, neither were AC unfortunately, so no vacuum switches.... Link to comment Share on other sites More sharing options...
zclocks Posted October 29, 2020 Share #9 Posted October 29, 2020 (edited) 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. Edited October 30, 2020 by zclocks photo Link to comment Share on other sites More sharing options...
Zed Head Posted October 30, 2020 Share #10 Posted October 30, 2020 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. Link to comment Share on other sites More sharing options...
Z Excellence Posted October 30, 2020 Author Share #11 Posted October 30, 2020 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. Link to comment Share on other sites More sharing options...
zclocks Posted October 30, 2020 Share #12 Posted October 30, 2020 (edited) 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 October 30, 2020 by zclocks 1 Link to comment Share on other sites More sharing options...
Jeff Berk
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