Hot air only comes through vents when below 80°f

caddydylan02caddydylan02 Member Posts: 1
edited March 2015 in Cadillac
Not sure why, but I can only get air through the vents in my 1990 deville when I set the temp below 80°f. Anyone know why this is?

Best Answer


  • imidazol97imidazol97 Member Posts: 26,995
    edited March 2015
    I'm operating on faint recalls of posts in Buick forums.
    It seems to me that some early 90s Buicks had the same
    configuration to their dash vents so that they couldn't
    be used in colder weather to warm hands as soon as
    there's warmth in the air like I do. There was something
    in the logic assuming if you wanted heat it needed to
    come out at floor level (or defroster and floor)
    rather than dash. It seems to me the automatic systems
    on Buick leSabres changed that in 1995 to the system
    used through 1999 leSabres.

    After that the whole HVAC box changed to a different

    2014 Malibu 2LT, 2015 Cruze 2LT,

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