[s-cars] Windshield fogs up in cold weather & AC is off

[Wayne Dohnal]

Is your dashboard OAT readout correct? I found out the hard way that whatever this reads is what the HVAC controller thinks the outside temp is, and if it's reading too low, the compressor won't kick in.

Wayne
1994 S4

>The AC indicator light on the HVAC
>control panel is unlit.  If I push the AC button on the control panel
>the indicator light illuminates as long as I hold the button down, but
>goes out when I release the button.