What tune does it whistle? Just kidding. Try this: Close everything tight. Turn heater blower on high. From the outside take some soapy water and dab around the vent window-leak should show up as a bubble. If this fails change channels-might be whistling a differant tune. (LOL-still just kidding)
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56 Chevy Bel-Air 2dr. HT (purchased new)
71 Chevy Cheyenne SWB PU (502HO)
65 GMC short bed step--work in progress and my gofer
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