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Discussion Starter #1
02 deville a/c only blows out of floor and defroster vents at the same time.It will not blow out of the dash vents.What could the problem be and how hard would it be to fix.Thanks,Guy.
 

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1926 Model T street rod, 2000 Jaguar XJ8, 1999 Corvette.
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6,738 Posts
Most times with that problem, its a vacuum leak under hood. If no vacuum reaches the programmer, it defaults to defrost mode to keep the winshield from fogging up if its winter.
 

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2005 Cadillac DeVille DTS
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150 Posts
No vacuum control on these vehicles... HVAC actuators are all electronic.

Start with Ranger's advice - always good.

Joe
 

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2003 Deville Base
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5,433 Posts
What is DTC's I have same problem
what car do you have? see the sticky at the top of this page on how to pull codes. If it's 1996 or later, the codes will read out as a letter followed by four numbers. Refer to the definition list. When you post codes always include the definitions along with whether the code is Current or History.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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20,220 Posts
What is DTC's I have same problem
=====================
we NEED more SPECIFIC information -

start with the year - make - model of the car -

THEN a detailed description of your SPECIFIC problem -
 
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