I would imagine your Dash A/C is in the default mode sending all air to the defroster vents. A clear sign that a vacuum hose is off or broken, or your vacuum pump quit working. Diesels make no vacuum, so a pump has to be added to work vacuum accessories like the heater and A/C controls on the dash.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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