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8 The passenger-side outside air vent is plugged using a plate provided by Classic Auto Air. It is secured by drilling with a 1⁄8-inch bit, using 3M Rope Caulk sealer around the screws to keep water and dust out. If you don’t want to drill the cowl, a high-strength industrial adhesive or silicone sealer can be used instead to secure this plug. All you have to do is remove the foam rubber seal.