Ventilation fan on continuously - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com

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Ventilation fan on continuously
Posted by MT-Erik [Email] (#1104) [Profile/Gallery] (more from MT-Erik) on Sun, 6 May 2018 13:12:35
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Here's a weird one - In my -02 Viggen, the other day my ventilation fan suddenly went to high speed while I was driving, and the fan speed would not respond to any input on the ACC. Then when I turned off the ignition, the fan continued on high speed. I had to pull the fuse to stop it.

I looked at my Haynes wiring diagrams, and they show only the manual climate control, but other than the innards of the ACC, the outputs are probably the same. I can't for the life of me figure out how this might have occurred, since the ACC only gets power through the ignition circuit relay. Any ideas?
_______________________________________
- Erik
_____________________________
'87 900S 3-door (sold)
'88 9000T (rust in peace)
'91 9000T (son drives)
'93 9000 Aero (daily driver)
'95 9000 CSE (RIP)
'01 9-5 LPT wagon (RIP)
'02 9-3 Viggen (daily driver)
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