No airflow from the center vents, or hot air?

No airflow can be caused by the pushbutton module itself, the solenoid valve assembly, the vacuum pod, or even a bad pipe.

You'll get rather warm air out of the left side center vent if there is insufficient refrigerant flow, but the right side center vent may be cool or cold.

Note that when you have insufficient refrigerant flow for any reason, you also have insufficient oil migration. You will eventually destroy your compressor if you keep running it.

A damaged duovalve would allow some hot coolant to flow through the heater core at all times; you would get cool rather than cold air. The center vent malfunction sounds like the CCU thinks it is heating rather than cooling. Can you manually open the center vents by pressing the appropriate button?

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

Hi Guys
Is there any way to open the center console vents ?
They open for 1min then close. Thanks Greg

The Individual Flap Tests are run by idling the engine, pressing the left and right "AUTO" buttons, setting temperatures to 72°, manually opening the fascia vents, and simultaneously pressing the "Rest" and "Recirculate" buttons for more than five seconds. The first step: Left display "0" and right display "LO" should appear. Pressing the left "AUTO" button changes the steps. Pressing the right "AUTO" button varies the two modes "HI" and "LO" for each step.


The functions that are checked are described in Chart 2 and can be verified by the actual air flow changes enacted. Figure 3 shows the third step (DTC) with "2" indicated on the left side and the "HI" mode indicated on the right.
All of these tests are so easy to run that they should be done frequently to gain familiarity with them. They definitely should be run before and after major dash surgery.
http://www.continentalimports.com/ser_ic40142b.html

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96 E300d

Hi Guys
I did the vent test center vent still didnt open . Can I force the vent open with a rod ? I noticed that the defroster vent stays open all
the time. Does anyone know the number on the air door vacuum solenoid valve to open the center vents ? Thanks Greg