fresh air supply
 

Anyone have a problem like this
1988 560 sl
Fresh air flaps not opening at all
Checked vac pods holding vacuum
Will open with vacuum manually placed in line
And blower motor intermittenly not working
Any dirction with help would be appreciated
Also noted not geting any vacuum to recirulated air switch (s24)
Could the problem be switch over valve unit (y34 )
Mine unit has all 4 controls in one unit