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

[Jerry Scott]

The compressor will not come on below a certain temperature and I believe it
is 32F.
Jerry

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of Thomas Rodriguez
Sent: Saturday, November 17, 2012 10:21 PM
To: s-car-list
Subject: [s-cars] Windshield fogs up in cold weather & AC is off

Now that the weather is cold my windsheild fogs up when I run the heater or
defroster.  I believe this is because the AC is not operating when the
outside air temperature is cold, so it doesn't remove the moisture from the
air before it passes through the heater core.  It is my understanding that
the AC is supposed to run in the winter expressly for this purpose.  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.  I am confident the
fogging is not due to a coolant leak into the HVAC system; I recently
replaced the heater core and there is no coolant odor inside the cabin and
no drop of coolant level in the reservoir.  The heater works great (aside
from the moisture) and the AC worked great during the summer.  Am I correct
that the AC should be operating in concert with the heater & defroster?  Any
tips on how to correct this?

Thanks,
Tom Rodriguez
'95 S6
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