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2 When you order your new radiator, make sure you order radiator-to-core support seal strips so the job can progress without a hitch. With the core support cleaned up, the next step was to install the radiator-to-core support seals. The core support seals have line-up holes in them so they can be placed in the correct area. We removed the two-sided tape that the seal strips come with and used 3M weatherstrip adhesive to securely hold them in place.