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...
Or watch this:
It’s for the Touareg but the same stuff applies to your Jetta.
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