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That graphic is not accurate for my 85. I can't get heat from the AC vents at any time. Only AC blows out the AC vents. I suspect they (Porsche) changed it later since that graphic says 86 to 89 models.
The fresh air is mostly a joke. The only time I use it is at an autocross, full fan speed blowing some on the floor, and some on the windshield at an autocross, just to get more air into the car. I rigged up a switch to disable the compressor, so I can turn on the AC system and have that air blow on me, even if the compressor is not running.
Air blowing on my face is helpful. Our autocross rules and any track day is no AC usage. They don't want water dripped on the track for other cars to drive through.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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