CapeCodAudi

<center><img src="http://pictureposter.audiworld.com/122085/plug2.jpg"></center><p>
the hose starts from rear of engine about 1 inch diameter and turns in to the back wall of engine bay. It then comes through the otherside next to the battery and power steering or brake fluid resevoir??(sorry not sure what it is never fill it so not sure if its the PS or Brake fluid. But the hose in question is hissing when moved?? What the hissing noise?? I have a small evap leak code that started when my timing belt was done.... please help

the hose is the one reverse "L" looking with the Audi rings on it.. has a rubber sealer around it.. noticed the sealer wasn't locked in all the way and when putting it back in noticed the hissing noise

GBW

That would go through the wall between the engine and the battery, and continue through that space, through the real firewall to the heater core.

CapeCodAudi

<center><img src="http://pictureposter.audiworld.com/122085/plug2.jpg"></center><p>
i don't know how to its the black hose with white writing behind the coolant reserve.. it goes straight down and to the left toward the engine... look like the only one with white writing and Audi 4 rings imprinted on it??

Suffolk

Seriously, every computer has a "paint" program. Then save as a DIFFERENT name (one letter different okay, then rehost it to link to it.

I see the hose from your description.

i don't know, but "hissing" would be a vacuum line of sorts.

HVAC control head feed?

HTH

CapeCodAudi

<center><img src="http://pictureposter.audiworld.com/122085/plug22.jpg"></center><p>please help with what this hose is!!

4Driver4

Vacuum hose to brake booster.

Julian_B

Brake booster hose???

CapeCodAudi

?? I take it thats not my EVAP small leak Its funny though when I moved it today the EVAP code went from a Small Leak to Large Leak


its now back to small leak though... I never saw a large leak code till i wiggled that today and i've been getting codes for 3 months

4Driver4

The hard plastic hose plugs into a rubber grommet at the brake booster. Some wiggling there will produce a hiss/leak, but if it's leaking from somewhere else, you might have a cracked hose.

It's not related to your evap issuse. The evap stuff is by the airbox. Check for leaks over there.

CP

Who cares what it does. It's cracked, so get another one.