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I had a 2003 Jetta Wagon TDI with a 5 speed. I did a grill block on mine on the middle grill opening. If I remember correctly it has 2 horizontal fins to make 3 openings and I blocked 2 of them. Popped out the grill, closed them off with black duct tape and popped the grill back in. I thought it might be an issue in the summer but I never had a problem and I lived in Alabama at the time.
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