All it does is allow air to escape when running the climate control, changes in altitudes, slamming doors and trunks and such. It also allows a certian amount flow through for air exchange.
Joe
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Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.
Raleigh NC
919-881-0364
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