[T3] Top Causes of Exhaust inside car?

["Pamela Peeples" <Type3VWSquareback@hotmail.com>]

<x-charset iso-8859-1>What would you say are the top reasons for getting exhaust inside the
car? There are no apparent holes in the underbody of the car, deck lid 
over engine is sealed good, and rear door seal is in fairly decent 
shape.  Any ideas?

On a similar but different matter; will old heater boxes get you exhaust
in the car when the heater is turned on? Do heater boxes go bad??

Thank you!
Pamela
'73 Squareback, Daily Driver once again!
Prescott Valley, AZ

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