I have found that the foam around the flap itself gets to a point where it does not close well enough to prevent air flow. The other issue is that the car must provide the vacuum to keep the flaps closed , if there is a leak elsewhere there may not be enough vacuum to keep them closed completely. Mitty vac at the pod itself may do the trick but the car system may not
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Ron
2015 Porsche Cayman - Elizabeth
2011 Porsche Cayman - Bond,James Bond
Sadly MERCEDESLESS - ALways LOOKING !
99 E320 THE Queen Mary - SOLD
62 220b - Dolly - Finally my Finny! Sadly SOLD
72 450SL, Pearl-SOLD 
16 F350 6.7 Diesel -THOR
19 BMW X5 - Heaven on Wheels
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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