Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Diesel Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 11-06-2013, 01:14 AM
Registered User
 
Join Date: Nov 2012
Location: Mesa, Arizona
Posts: 1,720
Heater Hose Routing and Flow

A long while back, went to a "D.Y.I." shop to see about addressing the bad monovalve. Well, they wouldn't let me see what they were doing and to top it off, stole my special hose vise grip! So I understand and recall from this Coolant hose in the way of Oil Filter Housing the hose attached to the block goes to the upper heater tube? Then how does the U shaped piece fit in?

Can anyone explain how the coolant travels? I recall somewhere seeing something, but alas, can't find it...

Thank you all in advance!

__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
Reply With Quote
  #2  
Old 11-06-2013, 02:30 AM
Zacharias's Avatar
Not so amused
 
Join Date: Apr 2010
Location: West Quebec
Posts: 4,025
The heater hose coming out of the firewall into the head is returning coolant from the heater core back to the motor.

You refer to the "U shaped hose" if you mean you are looking at the Mercedes parts diagram, they show a U shaped hose but their parts diagrams are representative, not necessarily accurate. They in fact list six part numbers for that hose, dependent on model, and they are all different. (I happen to be shopping for one, so I know this.)

Many cars no longer have the factory hose and just have a generic length of hose installed there, or have the incorrect part number installed -- as is the case with my 300td -- and it's a royal pain to work around it.

You don't need a hose clamp to replace the element in the monovalve. You will get some minor spillage but that is normal.
__________________


Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
Reply With Quote
  #3  
Old 11-06-2013, 10:53 AM
Registered User
 
Join Date: Oct 2007
Location: St. Thomas PA
Posts: 957
The heater hose coming out of the firewall into the head is returning coolant from the heater core back to the motor.

I think you have that reversed- the hose on the head is the hot supply to the heater core. The mono valve is on the return side, as is the auxiliary water pump.
__________________
'83 300D, 126K miles.
Reply With Quote
  #4  
Old 11-06-2013, 01:29 PM
Registered User
 
Join Date: Nov 2012
Location: Mesa, Arizona
Posts: 1,720
Thank you all for the help!

Somewhere I have a picture or pictures of the right side, so think I can figure that out. The left side I have nothing.

I have attached pictures of the hoses I have. As you can see I am talking about the hose on the left that makes a U-turn.

Sad to see N.L.A., but next time I see a 300D, will see if the heater hoses are any good.

Oh, and the reason I pulled the metal pipes was to make it easier to pull the anti-sway bar and they are rusty. Tried the apple cyder vinegar trick, but only made them more rusty... Will go back to what I know: phosphoric acid. Just wanted something enviromentally friendly, but alas, there isn't anything.
Attached Thumbnails
Heater Hose Routing and Flow-img_20131106_101952_091%5B1%5D.jpg   Heater Hose Routing and Flow-img_20131106_102019_143%5B1%5D.jpg  
__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
Reply With Quote
  #5  
Old 11-06-2013, 01:35 PM
eatont9999's Avatar
Registered User
 
Join Date: Jan 2012
Location: Dallas, TX
Posts: 1,948
Quote:
Originally Posted by Adriel View Post
Thank you all for the help!

Somewhere I have a picture or pictures of the right side, so think I can figure that out. The left side I have nothing.

I have attached pictures of the hoses I have. As you can see I am talking about the hose on the left that makes a U-turn.

Sad to see N.L.A., but next time I see a 300D, will see if the heater hoses are any good.

Oh, and the reason I pulled the metal pipes was to make it easier to pull the anti-sway bar and they are rusty. Tried the apple cyder vinegar trick, but only made them more rusty... Will go back to what I know: phosphoric acid. Just wanted something enviromentally friendly, but alas, there isn't anything.
Take your old hose to some parts stores and see if you can match it up with a section from another hose and just cut out what you need. You will have to buy the whole hose, though.
__________________
1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge
Reply With Quote
  #6  
Old 11-06-2013, 01:45 PM
Registered User
 
Join Date: Nov 2012
Location: Mesa, Arizona
Posts: 1,720
Quote:
Originally Posted by eatont9999 View Post
Take your old hose to some parts stores and see if you can match it up with a section from another hose and just cut out what you need. You will have to buy the whole hose, though.
Why do you all not understand?! Maybe need to make it bigger?

What I need to know is, do I have all the hoses? If I do, then where does the one coming out of the block go versus the U-turn hose?
__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
Reply With Quote
  #7  
Old 11-06-2013, 02:26 PM
Registered User
 
Join Date: Oct 2007
Location: St. Thomas PA
Posts: 957
The hose coming from the head feeds the steel pipe with the "Y" connection that feeds both sides of the heater core. The return exits the firewall just to the right of the driver's side cowl drain tube, and crosses behind the valve cover to the mono valve. Let me know if you need a picture.
__________________
'83 300D, 126K miles.
Reply With Quote
  #8  
Old 11-06-2013, 02:55 PM
Registered User
 
Join Date: Nov 2012
Location: Mesa, Arizona
Posts: 1,720
Quote:
Originally Posted by rscurtis View Post
The hose coming from the head feeds the steel pipe with the "Y" connection that feeds both sides of the heater core. The return exits the firewall just to the right of the driver's side cowl drain tube, and crosses behind the valve cover to the mono valve. Let me know if you need a picture.
Pretty please!


Thank you so very much!
__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
Reply With Quote
  #9  
Old 11-06-2013, 03:45 PM
Registered User
 
Join Date: Oct 2007
Location: St. Thomas PA
Posts: 957
Here are your pictures:
Attached Thumbnails
Heater Hose Routing and Flow-dscn0268.jpg   Heater Hose Routing and Flow-dscn0269.jpg   Heater Hose Routing and Flow-dscn0270.jpg   Heater Hose Routing and Flow-dscn0271.jpg  
__________________
'83 300D, 126K miles.
Reply With Quote
  #10  
Old 11-06-2013, 03:54 PM
Registered User
 
Join Date: Nov 2012
Location: Mesa, Arizona
Posts: 1,720
Quote:
Originally Posted by rscurtis View Post
Here are your pictures:
Thank you so very much!

So now I see I have all the hoses. Next step will be check the pile of hose clamps I have from a trip long ago to the yard and see if I have enough, as doubt the clamp stayed on when the core was bypassed.
__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
Reply With Quote
  #11  
Old 11-07-2013, 12:11 AM
macdoe
 
Join Date: Sep 2007
Location: Canada
Posts: 759
I paid 65 bucks for that hose from the head to the firewall that runs along the oil filter tower lid.... talk about a hose job....
Reply With Quote
  #12  
Old 11-07-2013, 12:34 AM
Registered User
 
Join Date: Nov 2012
Location: Mesa, Arizona
Posts: 1,720
Quote:
Originally Posted by macdoe View Post
I paid 65 bucks for that hose from the head to the firewall that runs along the oil filter tower lid.... talk about a hose job....
Well darn that is a lot! If it were me, I just might use standard strait and use the wire coils to bend around.
__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
Reply With Quote
  #13  
Old 11-07-2013, 07:27 AM
daw_two's Avatar
diesel enthusiast
 
Join Date: Jan 2007
Location: Germantown, TN
Posts: 5,445
part out

Hey --- I've got a 78 300D that I'm parting out. I'll take a look at the hoses tonight if you shoot me a PM.
__________________
daw_two
Germantown, TN

Links:
Current Car --- 05/2012 1984 300D Light Ivory, Red interior
Cluster Needles Paint
New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more
Reply With Quote
  #14  
Old 11-07-2013, 11:01 AM
Simpler=Better's Avatar
Ham Shanker
 
Join Date: May 2008
Location: Baltimore, MD
Posts: 2,544
You can always get a longer piece of generic hose and go around the outside of the oil filter
__________________
$60 OM617 Blank Exhaust Flanges
$110 OM606 Blank Exhaust Flanges
No merc at the moment
Reply With Quote
  #15  
Old 11-08-2013, 09:51 PM
Registered User
 
Join Date: Nov 2012
Location: Mesa, Arizona
Posts: 1,720
So made some time this evening to get something done and this is one.

I am finding a lot of this scale in the tubes, with this peice one of the worse. Should I be concerned? Is it still useable?

Also, where does it go?

Second, what hose goes between the lower pipe and the left heater core pipe? Hard to tell in the kindly provided pictures...

Thank you all in advance!
Attached Thumbnails
Heater Hose Routing and Flow-img_20131108_181058_940%5B1%5D.jpg   Heater Hose Routing and Flow-img_20131108_181136_837%5B1%5D.jpg   Heater Hose Routing and Flow-img_20131108_181223_570%5B1%5D.jpg  

__________________
Current fleet:

1985 Mercedes-Benz 280TE - Waiting for heart surgery.

1985 Mercedes-Benz 300TDT - Rear ended 23 September 2016 and now looking for a new home.

1979 Mercedes-Benz 300TD - Parted out.

1964 Volkswgen Beetle - Vater's since September 1968 and undergoing a restoration.

1971 Volkswagen Sunroof Squareback with F.I. - in need of full restoration.

1971 Volkswagen Squareback automatic with F.I. - Vacationing with her caretaker until he is in better health.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 01:02 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page