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Q:

thumping noise coming from under passenger dash. on 2009 Volkswagen Jetta

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Believe its related to heater blower. Doesnt happen all the time, When i turn blower off it goes away.
(1) Answer
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Probably so debris caught in the fan blades of the blower motor,we see a lot of rodents build nests in the air ducts as well particularly if the car has sat unused for a while. Remove the blower motor and inspect for debris and check the motor bearings and blades.