What heater pipe to use with JH/ABA Swap?

[mk1mark at gmail.com (Mark F.)]

On 9/11/05, Jeff Toomasson <area53@validpath.com> wrote:
> I've had my JH/ABA swap built on the engine stand for some time now and
> had forgotten about getting the correct heater pipe and hose setup
> collected. This is going into a mk1 that had A/C but won't going
> forward. It also has an external euro GTi oil cooler. I'd look at ETKA
> myself, but I can't get it working...
> 
> I think the heater pipe I have is for a mid-80's A1 (it's got the
> vertical stub near the driver's side coolant outlet on the cylinder head
> as opposed to the one from the '81 which has the fork in it). It's
> definitely not big enough to bolt to its two locations without bending.
> I have both styles of flange for the driver's side outlet - the
> dual-outlet one is stock and accommodates the old-style inline switch
> (what's it called again?) which always corrodes. I'd like to get away
> from this style but I can't remember what I need.


Jeff,

I thought I could answer your question, and even provide a picture of
what I did, but the ABA/JH combo I built a couple of years ago (now on
my shop floor) has had the coolant pipe stripped off it...  :(

I know I used the new "universal" pipe - the only one that the
dealership carries these days (non forked).  I also remember not
having the old-style inline switch installed, and buying a new "peace
pipe" coolant hose...  When I tried piecing the parts together it
looks like I used the single outlet coolant flange (side of head), and
ran the peace-pipe off of it into the heater valve.  The heater core
return hose mated up to the metal coolant pipe.

It doesn't look right to me though...  The setup I described has no
coolant flow out of the side of the head if the heater valve is
closed.  Anyone know if this is a no-no?  (ie: is there another
coolant return path to the pump other than from the port on the side
of the head that I'm not thinking of?)

I'm afraid I just muddied the water here rather than answering your
question, but I'm curious to find the answer as well...  I'll try
looking at my parts pile again to see if I can unstick my memory
(which sucks...).

Later,

Mark.
75
80 S
86
90 Audi Coupe Quattro - 10vt