1999 DeVille Heater-A/C will not go in "Auto" mode. Stays in "ECON"

1431 Views 3 Replies 4 Participants Last post by basscatt, Mar 24, 2015

STS Doug

Discussion Starter · Mar 24, 2015

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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basscatt

· #4 · Mar 24, 2015

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

STS Doug said:
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/forum...ncluding-1985/138257-how-pull-codes-dtcs.html

if you have any codes - post them here -
ALONG WITH THEIR DEFINITIONS -
------------------------
we expect to see a LOW REFRIGERANT code

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