Why does the vent on my vehicle blow warm air on cool days? Car Doctor

I do not want to run the air conditioner on warmer days. I have the vents on “outside” air, but the air coming thru the vents is warm … very warm.
Cars

Classic Buick GMC

A dealership's rating is based on all of their reviews, with more weight given to recent reviews. Includes reviews of Classic Buick GMC from DealerRater. Want to share your experience with this ...
Cars

Ewing Buick GMC

A dealership's rating is based on all of their reviews, with more weight given to recent reviews. Includes reviews of Ewing Buick GMC from DealerRater. Want to share your experience with this ...