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Some claim the underpulley actually helps cooling, if I recall it was related to the water pump efficiency at a slower spin speed. My car never overheated as a result of the pulley, no issues whatsoever. As for the AC, it still worked well for NY now how would it be in Miami in August? I think you might notice a loss but you wouldn't be dying for AC. You will feel the underpulley difference immediately and the installation is pretty easy.
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