Early HVAC vacuum diagrams & central locking
#1
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I had an interesting time troubleshooting an existing system, which was set up completely wrong.
I used a Porsche service information book from 1978, found it to be good but inaccurate or lacking info.
I've modified the page for further clarification. When I have more time, I'll post up more info on troubleshooting.
To download PDF, click here.
![](http://members.rennlist.org/jadz928/928%20HVAC,%20AC%20version,%20vacuum,%20revised.jpg)
![](http://members.rennlist.org/jadz928/928%20HVAC,%20AC%20version,%20vacuum2.JPG)
I'll post up the central locking as an append, but no changes were required. Useful info none-the-less.
I used a Porsche service information book from 1978, found it to be good but inaccurate or lacking info.
I've modified the page for further clarification. When I have more time, I'll post up more info on troubleshooting.
To download PDF, click here.
![](http://members.rennlist.org/jadz928/928%20HVAC,%20AC%20version,%20vacuum,%20revised.jpg)
I'll post up the central locking as an append, but no changes were required. Useful info none-the-less.
#2
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Thanks Jim.
I am pretty sure all my vacuum flaps are not working properly and thus impacting my AC operation.
I am pretty sure all my vacuum flaps are not working properly and thus impacting my AC operation.
Last edited by jwillman; 05-27-2012 at 02:27 PM.
#3
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#4
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#5
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Thanks Jim. I will d/l the PDF when I get home.
I found (1) of my vacuum diaphragm valves blown apart (one above the CE)....the plastic failed, but the rubber inside was good. I reassembled, coating the rubber bellows with WD and epoxied it, clamping together for a few days. Worked like a champ on the vacuum tester....Won't know real world until I start putting her back together...
I found (1) of my vacuum diaphragm valves blown apart (one above the CE)....the plastic failed, but the rubber inside was good. I reassembled, coating the rubber bellows with WD and epoxied it, clamping together for a few days. Worked like a champ on the vacuum tester....Won't know real world until I start putting her back together...
#6
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how did I miss this thread? Thnx Jim, subscribed.