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Old 05-02-2010, 12:07 PM   #2 (permalink)
Christ
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The cooler of the two lines after a "spirited" drive will be the return.

You can also check by starting the car in neutral with one line disconnected... the return line won't spurt fluid out under pressure, although some may still come out.

If there are two different sized lines, I believe the smaller one tends to be the return.
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