I was changing the MAF tonight and I accidentally pulled this grey tube and loosen up the connection somewhere at the left side of the engine compartment. It comes out of at the rear of the engine and to the air condition area. When the engine is on, I can feel the vacuum pressure in the grey tube. Does anyone know where this go? And how to I fix this? TIA

John

Those are vacuum tubes. They may have snapped off from its connection.

that connection always breaks on these cars. just cut it on either sides of the connector and connect it back with a small piece of rubber vacuum tubing.

JUST fixed this yesterday!

Here's the link:
https://mbworld.org/forums/w210-amg/...cuum-line.html

Thanks for responding. My problem is finding where to stick the broken pipe to since I don't know where it is broken. Can you give me some idea or picture of where to re-attach to. Thanks.

John

It's so obvious, you'll be surprised when you find it.

In your first pic, the broken line should attach to that grey fitting in the bottom of the pic pointing up at a 45 degree angle. That grey fitting is a 90 degree vacuum fitting that originally connected your white tubing together before it broke.

You now have a piece of that grey fitting broken off inside the white line at the top of the pic.

Cut the grey fitting out of the line at the bottom and cut about an inch off the one at the top and then connect both white lines together with vacuum hose.

Thank you! You are right it was damn obvious. I need to order the broken part now.

John

If you're going to order the "broken part", be sure to also order some more white-colored hard vacuum line.

You're going to have to cut out the broken piece and then your hard line will be short.

I think that's why it broke in the first place: Too much tension between the two lines when installed at the factory.

As I recall, before settling on the "flexible vacuum line option", AutohausAZ had the hard vacuum line for around several dollars a meter.