Heater core hose hook-up

[Jim and Patsy Schurz]

Jim
  
  I am looking at the Audi 100/200 1989-91 Bently manual volume 2 in the  "Air Conditioner" section page 87.18.  Where it says under note: "  When connecting water hoses, the lower connection on heater core is  connected to the hose going to the water pump"  It seems from your  experience that the upper hose goes to the  water pump and lower hose to the cylinder head.  This is what the  formed hoses want to do when installed through the firewall.   Perhaps Bently is wrong, wouldn't be the first time.
  
  BUONO on this list has suggested there may be a check valve in the heater core???
  
  Thanks
  Jim
  1989 200Q
  
  Jim Dupree <jdupree914 at sbcglobal.net> wrote:              Jim,
  I have seen the inside of more than one Audi heater   core and never saw anything that would make the direction of flow matter one way   or the other. 
  What Bentley are you looking at? 
  My 84 - 88 5000 Bentley does not have a   section 80 Heater and I did not find a routing in the section 87 Air   Conditioning. It may be missing from my (very old well used) manual or I   may have over looked it. 
  I can only find vol 1 of my 89 - 91 100/200   Bentley and it does not cover the heater/AC.
  My 77 - 83 5000 Bentley shows upper hose should go   to water pump and lower hose to cylinder head. 
  My 93 S4 has the upper hose going to the water pump   and lower hose to the cylinder head.
  I have done a lot of Audi heater core replacements   and never had a problem related to the hose connections. I don't recall ever   comparing the Bentley to how the hoses were connected to begin with but I   usually did not pull the hoses out of the grommet in the fire wall since it was   a PITA. 
  I would be more concerned that the hoses are routed   so the are not going to be damaged. If your Bentley is clear and hose are   safe then go for it.
  Good Luck
  Jim
  1993 S4
      ----- Original Message ----- 
    From:     Jim and Patsy     Schurz 
    To: Jim Dupree 
    Cc: Audi 
    Sent: Monday, January 30, 2006 8:24     AM
    Subject: Re: Heater core hose     hook-up
    

    Jim

If it dosn't matter how the hoses are hooked-up     why would Bently advise they need to be hooked-up a specific way??      Perhaps the design of the heater core requires a specific direction for best     flow.

Jim
1989 200Q

Jim Dupree <jdupree914 at sbcglobal.net>     wrote:    Jim,
It       does not matter which hose is connected to which nipple. The coolant       will
flow through the core fine either direction. Be sure your hoses are       routed
and connected such that they are not rubbing or under strain and       you'll be
OK.
Take Care
Jim
1993 S4

----- Original       Message ----- 
From: "Jim and Patsy Schurz" 

To: "Audi" 
Sent: Friday,       January 27, 2006 1:49 PM
Subject: Heater core hose       hook-up


> 1989 Audi 200Q.
>
> Could someone verify       how the heater hoses hook-up to the heater core,
ie which heater core       nipple connects to the water pump pipe. When
installing the new hoses       through the firewall the way it appears they
should go based on their       preformed bends the waterpump hose connects to the
upper nipple on the       heater core. This is the way I seem to remember taking
the old hoses out.       But this is opposite to what the Bently manual says.
>
> I would       be most greatful if some one could check an existing       vehicle.
>
> Thank you
>
> Jim
> 1989       200Q
>
>
>
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