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Radiator Big Gap

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File this under "things we never would've thought of without the truck overheating": The 1-inch (or larger) gap between the radiator and the core support can allow air to flow up and around the radiator. The gap was so big that we could drop a screwdriver and it would fall to the ground. When we put the radiator in, we were just worried about the metal destroying the radiator with vibrations.