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transmission cooler line
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  1. Chevy Silverado Forum (GMC Sierra)
    I have a 2003 Silverado 1500hd and it has an issue with blowing the transmission cooler lines out of the fittings. First time it happened I replaced that line and both fittings, drove it a few blocks and it blew it off again. Took all lines off and blew through them and blew through the coolers...
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