Blend door issue
Outside temp 45° heat on set on 75° vent,floor
defrost all selections,when making a turn left or
right cold outside air rushes in then returns to
warm after turn.The opposite in summer when ac
is on any selected position blows cold air until a
turn left or right the faster into turn the more
unwanted warm air,the same in winter with cold air
burst thru until turns complete?