ive been noticing recently in the last few weeks now that my hvac has been getting stuck on certain vent positions and wont change when i select dash vents or defrost right away. it usually takes it like 10 to 20 min before the vent will switch to the setting i switched it to. after it does change it will change when i switch the control at a normal speed seems cold related and as the hvac warms up it will switch the setting. what part should i look at?

well, one possibility is the little foam gaskets on the blend doors are failing and draggging or getting 'bunched-up' in some way. I have even had older cars 'spit-out' pieces of foam from the vents. But, I have no idea if failures like that in Texas would be common elsewhere. Heat here is brutal on many plastics and rubbers.

On 12/30/2021 at 1:40 PM, 1 Lucky Texan said:

well, one possibility is the little foam gaskets on the blend doors are failing and draggging or getting 'bunched-up' in some way. I have even had older cars 'spit-out' pieces of foam from the vents. But, I have no idea if failures like that in Texas would be common elsewhere. Heat here is brutal on many plastics and rubbers.

it does function normally most of the time. seems like when its very cold thogh is when it gets stuck