1996 S320 HVAC/ vacuum problem.

[bgree20]

Hello hopeful someone can help me with this problem. I have searched the form and have found some good information, but I am not sure that it is relevant to my problem.

I have a problem with the HVAC system in a 96 S320. I think I have narrowed down the problem which is related to a vacuum leak. The vacuum line that feeds into the switch over valve is the same amount of vacuum as other vacuum lines coming out directly from the engine. Under acceleration the vacuum line that attaches to the switch over valve drops to 0. Could this be a problem with the vacuum reservoir or maybe a check valve?
Also, if anyone knows where the reservoir is located? Do I have to take the front wheel housing out in order for me to access it? Before I bought the car the HVAC system never worked correctly, I am not sure if the vacuum lines on the switch over valve are in the right port, I have looked on alldata and the picture of the switch over valve is different from what I have in the car.

Does anyone know the correct color vacuum line to port into the switch over valve? Also I am having a hard time finding information on which vacuum line goes where on the PSE pump. My main concern is the part that is associated with the HVAC system, I think it is the transparent line, so it should go to p-? There is also two transparent lines that connect into one, could this be for the hvac? Where should they go?

Thanks in advance!