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Which line pumps fluid to the radiator core and which line is the return line. Want to hook up a transmission cooler.

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Two ways to tell....the one that is the hottest is the feed line, cooler is return. Or, disconnect the lines and disable ignition...crank the engine over a few times...the line that spits out fluid is the feed. (sloppy but accurate). Best way to connect an external cooler is in the return line. That way the radiator lowers the temp and the cooler finishes the job.

Posted on May 18, 2011

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