vacumn servos for a/c in 190

Can anyone tell me where the a/c vacum servos are in the 190 class? I believe my 86 16 valve's servos have failed. The recirc door stays open and I feel air coming out of the upper vents at all times. I know these fail, and my car has all the symptoms of this. Is it accessible thru the glove box? Thanks, Joe

[joe p]

scatterd around behind the dash. Some can be replaced through various openings, a coupld must be replaced with dash pad removed.


The thing to do would be remove the glove box door and pull out the switchover valves, test the servos/elements one at a time. The switchover valve block is kinda under the r/h side vent hose.


Joe

How many total servos will I have to get then?

ttt

[joe p]

The most comon one is the fresh air flap, which can be replaced with the dash pad installed. So can the defroster flap. There is one inside the case that requires removal of the dash. I've never replaced all on a 201 so I dont know how many there are, I beleive its 5 total. But, dont hold me to that.

According to my data, there are 4 inside plus the heater control valve under the cowl. The main vacum in is behind the boosteron the checkvalve/splitter make sure youve got good vacum to that point, also check the heater valve for leaks, either from under the cowl or from the switchover valve.

#1 main vacum in.
#3 and #4 blend air flap "cold"
#5 heater control valve
#6 defroster short stroke
#7 defroster long stroke
#8 legroom flap closed
#9 fresh air flap short stroke
#10 fresh air flap long stroke (recirc door)

Thats the layout for a 90 model 201 w/acc. I'd check #1, 5, 9 and 10 first, however, check 'em all. Aterall the switchover valve is already in your hand. Just be sure to remove the lines one at a time for testing, otherwise you might fix the leak but nothing will do what you want.



Joe

Joe-p:
Can you or anyone tell me the approximate locations of these servos? I do know that the legwell servo works ok. Also, when I removed the dash vents, I see the a/c evaporator. There is a metal rod just above it, and this moves left to right just fine. Behind the headunit, near the firwall, there is another servo just works when I hit the leg vents. Where is the 3way valve located in the car?
Joe

[joe p]

the 3 ways aka switchover valves are under the r/h vent, pull the glovebox and r/h vent, look right, its tucked under the vent air horn.


I think the blend flap is inside the case behind the acc panel.


Joe