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I just replaced my radiator on my 99 burban and am struggling with the transmission cooler line fitting leaking at the radiator. I'm using a fitted wrench (5/8) and I've tightened as much as I can but the fitting bolt is starting to strip.
Any suggestion?
 

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If I recall those are normal inverted flare fittings. You must have a piece of debris in there. Pretty foolproof connection.
 
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