secondly check a few things, 1 that your climate controls are all in working order (which you slightly explained above) including the center vent dial which is also a govern for heat/air. there are a few possiblities for this misshap, the worst case being that your final stage unit has gone bad, what i suggest is playing with the climate controls on A/C , heat and every range to see if any change occurs in heat/air placement. id like for you to check as much as you can before taking it to a pro to deal with as sometimes climate control issue can be quite troublesome and difficult to trouble shoot.
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