View Single Post
      08-26-2012, 05:17 PM   #2
kbsilver
Private First Class
 
Drives: 2011 335d
Join Date: Jan 2012
Location: Central Jersey

Posts: 164
iTrader: (0)

Somewhat of a guess but it may be a water bypass hose. If a lot of water enters the main air intake because of extreme spashing or high water this secondary air path prevents a high vacuum from being created that could cause the engine to pull the water up into the air filter causing water to be injested, which usually will destroy the engine.
kbsilver is offline  
0
Reply With Quote