Vacuum issues, loosing pressure at passengers foot rest connetions
07-13-2023, 08:15 AM
#1
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CL 420 (C140)
Vacuum issues, loosing pressure at passengers foot rest connetions
Hi!
I am currently struggling with the vacuum system and need some help.
I had multiple issues - for most of them I found already a solution with the data I found online and a really good vacuum pump for diagnosis.
As I have a Coupe I noticed that my seats dont lock. When all doors are closed you can still move the back of the seat. I then started to diagnose the seat but if you connect external pump or the engine directly the mechanism works like a charm.
Also I dont loose any vacuum - so all lines, membranes etc are fine at the seat and the seat valve. Hence, I loose air somewhere in front of the car.
I then went to analyze the "block" in the passengers footrest. All lines have vacuum except two: Red/White and Black/White.
I did not test red/white while the car was running. I assume it goes to the HVAC? Black/White however looese vaccum rapidly and it sounds like not far away but not in the passengers footrest. I guess this is from the vacuum storage?
Is there any diagram with color coding to see where the lines go? I found some for the individual systems but not for this.
Thanks!
I am currently struggling with the vacuum system and need some help.
I had multiple issues - for most of them I found already a solution with the data I found online and a really good vacuum pump for diagnosis.
As I have a Coupe I noticed that my seats dont lock. When all doors are closed you can still move the back of the seat. I then started to diagnose the seat but if you connect external pump or the engine directly the mechanism works like a charm.
Also I dont loose any vacuum - so all lines, membranes etc are fine at the seat and the seat valve. Hence, I loose air somewhere in front of the car.
I then went to analyze the "block" in the passengers footrest. All lines have vacuum except two: Red/White and Black/White.
I did not test red/white while the car was running. I assume it goes to the HVAC? Black/White however looese vaccum rapidly and it sounds like not far away but not in the passengers footrest. I guess this is from the vacuum storage?
Is there any diagram with color coding to see where the lines go? I found some for the individual systems but not for this.
Thanks!
08-09-2023, 01:45 AM
#3
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Join Date: Sep 2007
Location: Ibaraki , Japan
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S600L , 500 SEC -W140 , S500-W220, S550 -W221, SL500-R129, SL450,380 etc. W107
sorry, can't help with vac. hose diagram. I have a 94 600 CL I am parting out, if u may need any parts. Good luck.
