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What is your question?
WHY DOES MY A/C AIR KEEPS SWITCHING FROM THE VENTS TO THE DEFROSTER BACK AND FORTH WHEN I'M DRIVING. IT DOESEN'T DO IT WHEN I'M STATIONARY AT A LIGHT OR PARK.
1 Reply
Does this happen more when accelerating or going up a hill? There is probably a vacuum leak in the hoses, or the vacuum solenoids that control the blend door(s) in the heating and A/C system, this is a fairly common problem. Any loss of vacuum will cause the blend door to to change position with throttle setting.