One day I set to the task of cleaning them. Could not open the fourth screw with my screwdriver. Abandoned the effort.
Yesterday, I left university and was trying to push the car hard (130 km/h) when all of a sudden over zero-point the vents stopped blowing cold air. The rest of the 20 km journey was with windows down and loo coming in from the vents!
At night I thought to see if I can find something amiss before taking it to the mechanic.
Whether I turned the AC or not, the vents would blow warm air. I felt the two solenoids (as in the video). They were hot.
Does this mean, their cleaning is a must?
Moreover, what should I use to clean them? Cannot figure out from the video.