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If it is similar to the 2003 Bonneville with the 3.8L engine, then the answer is no. There is an O-ring inside of the quick disconnect, about 1/8" beyond the flare face that the tube pushes up against. You'll notice that there is about 3/8" of tubing between the flare and the end of the tube. The O-ring inside the quick disconnect fitting seals the tube at about the mid point between the flare and the end of the tube. I'm not an expert, but I'm guessing that the design of the fitting allows the ATF pressure to push the O-ring to a tight seal against the tube. There is not much pressure on the flare, it is just held in place by the snap ring, so we can be pretty sure that the flare is not really providing any oil sealing. Ed Clarkston,MI

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Q: Does the lower transmission cooler line on a 2000 Impala with 3.8 liter engine and radiator with quick connects require a seal or Oring be installed on the tube before sliding into the quick connect?
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