Help with Two Coolant Hoses

[Cody Forbes]

There are four hoses that ultimately feed the heater core. One from below the thermostat housing that is only maybe 10cm long that goes to a metal pipe. At the opposite end of that metal pipe (near the engine to bellhousing mating area, below the distributor) there's another hose from the pipe to the heater core. The other side of the heater core then feeds to the heater control valve which is between the engine and steering rack, then the last hose runs from that to the rear of the block just below the cylinder head. 

In a bind any of these can be replaced with regular hose, but the three at the back of the engine have some curves in them which makes the OE hoses the right choice for the long term. The one short one can be just a bit of straight heater grade hose from your favorite source. I believe all 4 are 3/4" hose, but it's been ages since I've had to change one so I may be wrong. 

Also change the (plastic) heater valve if you are in there. It'll crack eventually.

-Cody Forbes (mobile)

> On Aug 25, 2017, at 1:42 PM, Einhorn Hofmann <einhorn.hofmann at gmail.com> wrote:
> 
> Hi, I just posted a message with a photo, but it seems the list doesn't
> like photos so I'll describe instead.
> 
> One of my coolant hoses just split and fortunately I wasn't far from home.
> But I need to replace them.
> 
> The hose is one of two short rubber hoses that run side by side.  Viewed
> from the passenger side of the engine bay, the rubber hoses connect two
> sets of pipes, one coming from the engine and another going to somewhere
> under the steering rack.  I'm not sure if these pipes/hoses take coolant
> back to cool the transmission, or do they take coolant into the heater core
> for the climate control.
> 
> Are these special order items, or is this standard coolant hose of a
> certain size that I could pick up at Napa/Canadian tire?
> 
> I've been pretty good about changing the upper and lower radiator hoses as
> a precaution.  I never thought about these two.  While I'm changing these
> two, are there any other coolant hoses I should look to replace as a
> precaution?
> 
> 
> Thanks
> MC
> Audi 100, 1990 2.3L NF engine, Non-Turbo, Non-Quattro
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