Which Line Is which
Senior Member
Joined: Sep 2000
Posts: 1,704
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From: Mpls, MN
The lower line is the return.
With the transmission at operating temp, touch both lines on the radiator. You'll feel that the lower line is cooler because the fluid has already been cooled by the radiator.
With the transmission at operating temp, touch both lines on the radiator. You'll feel that the lower line is cooler because the fluid has already been cooled by the radiator.