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.