Excuse my crude MS paint artwork, but this is an idea I had to flush the transmission fluid in my T3 8 speed tranny. It comes from the same method I used to use to change the tranny fluid in my R50 Nissan Pathfinder. However with the Pathfinder you would just allow the cooler line to dump 2...
www.clubtouareg.com
Or watch this:
It’s for the Touareg but the same stuff applies to your Jetta.
Do you have some extra Aisin fluid around? cuz if not, why not just buy the correct fluid? I believe Valvoline MaxLife ATF works for just about everything and 1 gallon is only $20 at Walmart.
Double check your required fluid type and match it against the specs on the bottle to be sure.
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