Vacuum Noise from center vent.
 

1999 E320 sedan. I have a vacuum noise from the center vent area. The temp control doesnt work correctly (warm all the time). Also you can hear a air leak bleed down after engine is shut down (same area). I think it could be the left center blend flap vacuum element. The compreesor is running and high side pressure gets hot to the touch, but low side is barely cool. (compressor is not cycling- dont think its low on freon)THANKS for your help! JON

Start engine. AC on 72f. Press and hold "rest" button on CCU for 5 secs to enter diagnostic mode. Post values 1-8, use L/R auto buttons to toggle. Press rest to exit.

The get error codes and post also: Turn on the ignition, and set the left CCU temperature to "HI" and the right temperature to "LO." Then, simultaneously press buttons "Rest" and "EC" for five or more seconds. All of this must be done within 20 seconds. The "Recirculate" button will flash its LED. The screen will then go blank, and the first code can be brought up by pressing the right "AUTO" button.

THANKS! Another Question Please....
 

THANKS!
Test 1, engine cold
1-80
2-76
3-82
4-82
5-114
6-111
7-04
8-73

Test 2
E (left side) FF (right side)

Now..well? I have not got a manual or a repair book. Can you recommend the best? Is there a web site with code and tech info?
THANKS again for your help! Jon