AMGEEZY

Today I turned on my AC for the first time this year and I noticed that the middle vents do not blow. The 2 outer vents seem to blow just fine. But I can't get any air to come out the middle vents. It blows out the top and 2 outside vents. Does anyone have any idea what could be causing this. Even when I cycle through the different air flow positions, it doesn't seem to matter.

macclk

Sorry for this, maybe, stupid question, but did you turn the wheel near the wents to "open" posistion?

wnycec

this happened to me and i was covered under warranty so i didnt really care to understand the problem but i glimpsed at the service report and i think it mentioned that my evaporator was messed up or something.... has to do with the AC unit (duh) and it sounded pricey... sorry for the bad news.

AMGEEZY

All squared away, it was a vacuum hose on the intake. I must have tore it when I was cleaning my MAF or changing my filters.

NYCLK

I have the same problem but it's the OUTSIDE vents not blowing air. The 2 inner ones are fine.

Where are these hoses located?

OGCLK320

Sorry to bring this back from the dead, but where is this vacuum hose located in relation to the intake, I just installed vip's cold air intake, and my center vents do not work now, Is it the hose attachment located near the firewall on the intake?


Any help is greatly appreciated.

felixromero

I have an e500 2003 the right side is blowing nice cold air, and the side only hot air, any ideas?

slobodan

I had the same problem. The hose is located about dead center of the firewall on top. It is white and about an eighth of an inch in diameter. You can barely see in the back of my motor in the pic

OGCLK320

Thank you ^^

ungermm

I had a similar problem of no air flow out of the middle vent of my 1999 CLK320. I found the thin white tube and tracked it to the area next to the coolant hoses that go into the firewall. I was able to pull up the white tube and verify a nick in it. The nick was caused by a mouse that had nested in that area. Prior to my ownership, the car was parked very close to a field. I have great flow out the center vent now !

Here's a photo ...

ovaleclk

In the picture above, is there a way to find out the part number of the grey connector for the two white tubes? My connector broke and I need a way to connect the two white tubes. Want to fix this before I get in to the rest of the A/C issues. Car is 2001 320CLK.

Thank you

ungermm

The vacuum line connector is actually two parts (202 800 02 53 & 202 805 03 44). I think you can also get a elbow replacement from Pelican Parts like this one https://www.pelicanparts.com/catalog...FULEMI_pg4.htm. But, if you don't mind a DIY approach, you can just eliminate the connector with a small rubber hose to bridge the two white tube ends together.

cindyclk

I have same issue...I found where the thin tube attaches to vacuum...where does the other end go? How do you get to where it goes? Thanks

Serndipity

These links may have the answer.

Follow the link mentioned by 260e cruiser here: http://www.benzworld.org/forums/c208...cuum-hose.html

Then follow the links provided in that thread.

cindyclk

Thanks...seems to go through firewall into passenger foot well area. I did vent test and each vent showed a zero all around yet all are blowing all the time except center not blowing at all.

cindyclk

OK...still problem
here are issues.....all the vents are open except center...can't change them to stop using "flap test" or any other way
I swapped the vacuum lines for #1 and #2 flaps with another ones that were blowing...no change
I pulled the center vent out (lots of fun) and there is nothing coming up to the back of the vent unit.

Does anyone know where the actual flap is behind the dash that allows air to come up to the center? My plan is to manually open the flap and permanently keep it open (open and close the vent on the dash when don't want air from center)

cindyclk

I found what I hope is the problem...found the vacuum reservoir and the vacuum line going through the firewall had a broken fitting at the reservoir ....see pics on this thread...
https://mbworld.org/forums/clk-class...ution-box.html

cindyclk

success!!! got a connector for reservoir and voila, center vent blowing AC!!! If you have a center vent AC problem, start at the vent distribution box under glove compartment...I tested it with my mouth to see if suction....if none...trace back to air reservoir hidden behind wheel well (https://mbworld.org/forums/newreply....=714194)...see pics..etc...back to vacuum connection at engine....if any leaks along the way, the vents will all open and middle one stays closed....as soon as vacuum attached to distribution box, they should all operate normally.

Francis Thx

I have a similar problem, the vent work only when i set to central, when i start the the air is coming only up and down,any ideea?

cindyclk

read the above posts

Francis Thx

Now i understand, all vents are opening, but the midle stay closed if i have leak,when i set it to 9 o clock and back to 3 o clock all the vents are open, i gues i will have to work a litle, thank you very much.

bmwmike1

Very helpfull, Thank you

convicted

I just fixed this on my car. +1 to all the people who posted about the vacuum line under the hood.