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Does your Jetta have the dual-zone Climatronic system?
Does it have an "AUTO" mode setting?
Yes, I'm here. This is not like a regular chat. Every time you reply I need to look up information based on that reply. Are you OK with that or would you like me to opt out and see if there's a faster expert?
This A/C system has on-board diagnostic capabilities, which means you'll need a VAS1051/1052 to communicate control module and see what's causing this issue. Do you have access to that scan tool?
Without that tool, I'm afraid there's nothing I can do to help. I'll opt out so others may try. Please don't reply until another expert responds or the site will cycle this request back to me.