Since you're interested in this coolant circuit ..
you may find it interesting to note that ....
pretty sure, due to the two-door nature of the thermostat,
it operates in two states ( with overlap I would imagine ) ..

during warm up, when main coolant flow is blocked ( except for heater
circuit )
coolant flows through the oil cooler ( but not main circuit ) to help
warm up the oil.

later, when things are fully warmed up, everything is 'full cool'
..engine, oil cooler etc.

it's moot, as it only fits together one way.  We'll just trust they knew
what they were doing.
I happen to have a offical VW Booklet that is an introduction to the
'new' 2.1 engine and cooling system ..for VW dealer techs I image.

this book points out about a dozen ways the 2.1 cooling system is
improved over the previous 1.9 waterboxers.

yeah, just 'put it together.'
next we'll be talking about 'what type coolant' ..
and then 'bleeding' , right ?

On 10/1/2015 1:48 PM, John Rodgers wrote:
> Seems like the coolest water available would be routed into the cooler. I
> just don't know where the coolest water comes from,  the pump or elsewhere.
>
> John
> On Oct 1, 2015 18:08, "SDF ( aka ;jim lahey' - Scott )" <
> scottdaniel@turbovans.com> wrote:
>
>> the oil cooler only fits with the correct side against the oil filer
>> flange/boss,
>> and naturally the hose nipples need to point up.
>>
>> it really doesn't matter which way the coolant flows through it ..
>> and your hoses will fit naturally where they should.
>>
>> I just looked at one of my vans ..
>> the forward pipe connects to the forward-ish pipe nipple.
>>
>> the water pump pipe connects to the aft nipple.
>> I wouldn't be possibly to do it incorrectly even.
>> Scott
>>
>> On 10/1/2015 11:54 AM, John Rodgers wrote:
>>
>> In putting this back on, I need to know the hose hookup to get the water
>> flow in the right direction. There is a feed pipe that comes directly off
>> the water pump. With the cooler in place, which of the cooler pipe stubs
>> does that direct water pump pipe hook to? I've new short hoses for this but
>> had to cut the old hoses off, and no have no guide for proper hookup.
>>
>> Many thanks for the solution!
>>
>> John
>>
>>
>>
>>