Relieves cabin air pressure so that heater fan can blow adequate amount of air volume.
If you're buying new vent just to get new gasket, you would be better off just using a sealant around the vent.
Check recent posts on trunk leaks.
98 Mystique LS v6 atx 110,000km
97 Contour LX v6 atx 125,000km
stock CD on LS, cass on LX
spoiler, tinted windows on LS only
4 wheel discs on LX only
All other available options on both
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