78 928 heater/ac control

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23 Aug 2010 19:40 #703 by monte928
78 928 heater/ac control was created by monte928
trying to install a used one in good cond. My problem is the person that had the car before me cut all the wires and I need a wiring dia. to reconnect the new one, I got the vac. lines fig. out and I got all the wire plugs both ends Iam not sure what goes where. can anyone HELP

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24 Aug 2010 08:32 #708 by Kiln_Red
Replied by Kiln_Red on topic 78 928 heater/ac control
www.cannell.co.uk/928_Workshop_Manuals/1...20Flow%20Diagram.pdf

Above is a complete wiring diagram for your car. If that doesn't solve it for you, just let me know and I would be more than happy to post my own schematic for you with a picture or two. I believe the climate control functions are the same in my car. I would have to find out first but I think I can help.

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27 Aug 2010 15:07 #762 by mrrodfitz
Replied by mrrodfitz on topic 78 928 heater/ac control
HVAC controls & vents work fine, however, every now & then when I turn the a/c on, fan full speed, no air comes out; later, works fine.

Also, there's airflow only when the vent is open; when closed, nothing. Is the duct hose out of alignment?

Lastsly, where can I get new knobs for the sliders?

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27 Aug 2010 15:36 #766 by srshaw3
Replied by srshaw3 on topic 78 928 heater/ac control

HVAC controls & vents work fine, however, every now & then when I turn the a/c on, fan full speed, no air comes out; later, works fine.

Also, there's airflow only when the vent is open; when closed, nothing. Is the duct hose out of alignment?

Lastsly, where can I get new knobs for the sliders?


The system changes air flow based on a vacuum system. Cracks in bladders can cause issues. I would suggest reviewing the hvac vacuum system.

Buttons for the sliders are available as I recall. I would hope any of the good 928 vendors can help you.

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