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Ducting is one of the most overlooked parts of the vehicle. Air ducting and baffling are commonly removed when they crack or start to hang down. People ask themselves "What are these for?" and end up throwing them away. Well, they are there to direct air into the radiator. For a cooling system to work properly, air needs to flow through the radiator. That ducting and baffling is there to direct the air into the radiator. Without that ducting, air will take the path of least resistance, and will typically go under or around the radiator since the radiator is a restriction. On 1984 and older models, it's not as much of a problem as 1985 and newer models. 1984 and older models have grilles in front of the bumper, so air can typically go straight into the radiator, although ducting makes the cooling system work better. 1985 and newer models don't have grilles, so it is very important for the air deflector and ducting to bring air from under the front bumper and into the radiator.