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1999 Fleetwood Limited
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9 Posts
Discussion Starter #1
1999 DeVille Heater-A/C will not go in "Auto" mode. Stays in "ECON"

I noticed that my HVAC system will not switch into the "Auto" mode (stays in the "ECON" setting) on heat or A/C. I thought I saw a message on the dash message thing that the A/C refrigerant was low but it has not come back on and it is still in ECON. If I run the front defrosters the ECON will go off.

Thanks for any input.
 

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2001 Seville STS, 1990 Seville (RIP), 1972 Sedan Deville
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26,323 Posts
Yup, there's a leak in the system and you're low on refrigerant. The HVAC system disables the compressor/reverts to econ to stop damage to the compressor.
 

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Super Moderator
White Diamond '03 DHS (with DTS floor shift)
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87,198 Posts
Re: 1999 DeVille Heater-A/C will not go in "Auto" mode. Stays in "ECON"

And you are going to have to clear the low refrigerant code in order to enable the compressor before you add refrigerant (assuming you do it yourself).
 

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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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19,867 Posts
Re: 1999 DeVille Heater-A/C will not go in "Auto" mode. Stays in "ECON"

I noticed that my HVAC system will not switch into the "Auto" mode (stays in the "ECON" setting) on heat or A/C. I thought I saw a message on the dash message thing that the A/C refrigerant was low but it has not come back on and it is still in ECON. If I run the front defrosters the ECON will go off.

Thanks for any input.
--------------------------------------
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 -
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we expect to see a LOW REFRIGERANT code
 
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