W202 Vacuum PSE
 

I have searched for this answer to no avail. The images below show the main vacuum junction for the PSE and rear door. Problem is vacuum pump cycles while driving, so far replaced only PSE pump with used one - this did not help. So I suspect door actuator issue. I am trying to figure out how to disconnect the yellow tubing from the main connector and the door so I can check the vacuum levels. Any advise of where to check the vacuums would be greatly appreciated. My thought was to heat the tubes with a heat gun but I am afraid of either melting the tubing or deformation of the tubing.
:confused:
Attachment 33403

Attachment 33404

http://www.peachparts.com/shopforum/tech-help/142896-c280-1994-noise-fuel-filler-cap.html?highlight=pse

quote below is from from link above

the noise is from the pse pump (PNEUMATIC SYSTEMS EQUIPMENT) A/C door locks etc... what happens is usually a leaking vacuum element in the A/C system causes the pump to run like that, the pump provides vacuum assist to the climate control system when engine or supply vacuum is low, if one of the elements is leaking, it will cause the pump to come on to provide assistance. usually it is the defroster flaps that leak, this requires that the dash be removed to replace the leaking elements. another option is to disconnect and plug the line that goes to the climate control system. if neither is done the pump will continue to run and eventually burn it's self out, the pumps can be very expensive. if you fix the leak in time the pump will be spared, if you wait you will likely need to fix the elements and the pump, no sence in replacing the pump alone, the new one will just burn as well.

Nikki. To disconnect vacuum tubes use a hair dryer or heatgun on low setting and you shouldn't damage the tube, to refit immerse in hot water for a few seconds. If you just need to isolate a part of the vacuum system use a KLIPPIT ,as used for closing the necks of plastic bags, to clamp the tube.
Geo.

Carson356
 

Thanks Carson, interesting link, not sure how I missed that one. Nevertheless, any thoughts or instructions of how to replace the A/C control elements. My indy noted that these may be the problem, but I was not interested in removing the dash. Of course if there are any instructions I am willing to do so. I have searched several web sites for this original post and Shandy really answered what I was looking for - those hoses are really tight and will not pull off.

Again if you know any thing about the a/c vent diaphrapms let me know.

Thanks

the easiest fix is to cut the clear line at the pump and plug both ends,