[JohnDell]

2001 Deville, the air on the driver side blows out warm air and the passenger side blows out cold air, what could be the problem?

 

[Ranger]

If you are in A/C mode, you're probably a little low on refrigerant.

 

[aespino]

Hi the same thing happened to me and it was low refrigerant. It needs to be topped off. If it's not you will end up having the same problem.

 

[basscatt]

2001 Deville, the air on the driver side blows out warm air and the passenger side blows out cold air, what could be the problem?

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the FIRST thing you should do is to
check for Diagnostic Trouble Codes -
if you don't know how - go here and read the ENTIRE post -

http://www.cadillacforums.com/forums/cadillac-deville-1985-2005-including-1985/138257-how-pull-codes-dtcs.html

if you have any codes - post them here -
ALONG WITH THEIR DEFINITIONS -

--------------------------------

if you have no codes pointing to the MIX door actuators -

connect a set of AC gauges and post the pressure readings -
along with the ambient air temp -

 

[tlblack]

I just had the exact same problem last week I only had a half a pound of freon filled it up and the AC is freezing cold on both sides now