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Old 10-07-2007, 03:11 AM
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Join Date: Oct 2007
Posts: 2
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

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Old 10-07-2007, 12:55 PM
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Join Date: Feb 2004
Location: Walnut Creek, CA & 1,150 miles S of Key West
Posts: 4,874
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.
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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Old 10-08-2007, 02:49 AM
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Join Date: Oct 2007
Posts: 2
THANKS! Another Question Please....

Test 1, engine cold

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

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