What is 038121473 b?

buzzboy

Active member
Joined
Jun 23, 2021
Location
OBX, NC
TDI
1979 Mercedes 300SD BHW
I tore my BHW Passat apart 3 years ago and forgot where this hose attached. I can't figure out anything other than it being called Venthose
 

buzzboy

Active member
Joined
Jun 23, 2021
Location
OBX, NC
TDI
1979 Mercedes 300SD BHW
Sorry, I mean the big one in the middle of the photo that connects to the head just below the vacuum nipple. The one with the braided wrap. Its part number is listed on it, and the thread title, but I still can't figure out where it goes.
 

PickleRick

Veteran Member
Joined
Nov 29, 2017
Location
Greenville sc
TDI
05 GLS BHW sedan 5 speed conversion. BHW Carver SantaCruz in progress
Part of the coolant system that feeds into the metal coolant tube that runs along the glow plug side of the block. On my swap I deleted that tube in favor of a hose but have a brass tee that this hose ties into.

I had plenty of room to retain the oil cooler but deleted my expansion tank in favor of a radiator with overflow (87 Toyota 4 runner).
 

buzzboy

Active member
Joined
Jun 23, 2021
Location
OBX, NC
TDI
1979 Mercedes 300SD BHW
So I just need to tie it into the hot side of my cooling system and we're set.
 

PickleRick

Veteran Member
Joined
Nov 29, 2017
Location
Greenville sc
TDI
05 GLS BHW sedan 5 speed conversion. BHW Carver SantaCruz in progress
I honestly don't remember the return/feed directions as that part of my build was done sometimes between 2020-2021. If I remember correctly it feeds into the same section of tubing that the coolant reservoir ties into.
 

Koehn

Well-known member
Joined
Oct 25, 2018
Location
Vancouver, BC
TDI
2005 A4 Avant Quattro 6-Speed (AVF)
It wraps around the back side of the cylinder head, underneath the tandem pump, and connects back into the metal coolant pipe on the left side of the motor. Like this!

 
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