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I literally just got threw doin the blue devil thing it does not work I have a 1999 chevy tahoe I followed the direction to the letter I even got the radiator flush that ir suppose to use before u even poor it in folliwed them direction to the letter all it did was make my truck smoke really.bad an some go awful plastic burning smell so now ill just ja e to ...


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The first thing I'd try is to use a flat bladed screwdriver to gently pry the vent slats back to the open position. Chances are you'll have a bit of a pop and they'll move again. If you exercise them back and forth regularly they'll likely be fine without any further work. Cleaning them would be a good step, an old toothbrush may fit, otherwise some other ...


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