Question about 1998 Chevrolet Lumina

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Identification of transmission oil cooler lines. Inlet v Return

Without having to disconnect a transmission cooler line and run the engine to determine the direction of oil flow, I have no way to know which transmission oil cooler line is the return line. I have found no info online, Wix did not provide proper instructions with the filter kit, and the auto parts dealer does not have the information. Can anyone help? Anyone? Anyone? ;-)

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  • Chevrolet Master
  • 3,103 Answers

May need to go to a transmission shop and let them tell you which is which..only other way is to open a line and see which way the fluid runs..

Posted on Feb 09, 2014

Testimonial: "Thanks. I took the advice from a guy at the local auto parts store and used the bottom line. The way he explained it was very logical: Fluid from the transmission is delivered to the upper connection so the fluid just runs down through the cooler. Who could argue with that? So I cut the bottom tube and rolled a bead on both cut ends. Placed the filter high in the engine compartment where it is easy to access. I connected the two metal ends of the tubing with five feet of rubber hose and looped it up near the filter. Then I cut the hose and tightly secured small plastic bags to each end of the hose, ran the engine for a few seconds, and to determine the direction of flow I observed which hose discharged the fluid. To tell you the truth, I didn't confirm that I had selected the return line because I was interested in repairing the line and repeating the process on the other line if the instructions I followed were inaccurate. :-)"

  • analytica84 Feb 09, 2014

    Correction: I was NOT interested in repairing the line and repeating the process on the other line if the instructions I followed were inaccurate. :-)

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  • Chevrolet Master
  • 40,743 Answers

An oil cooler is just an oil cooler. IT allows the heat in the oil to be transferred to the air / water . The direction of oil flow is immaterial as the action is to transfer the heat out of the oil. Restrictions (if any) to the oil flow will be in the hose size or in the fitting and the end doesn't matter as it is the length of time the oil is in the cooler that allows maximum heat transfer. You most probably be having difficulty getting information because coolers can be connected either way ( depending on the hose size fittings)

Posted on Feb 08, 2014

Testimonial: "Thanks, but I was told that the filter is supposed to be on the return line, possibly because it will be exposed to lower temperatures."

  • Bill Boyd Feb 09, 2014

    The reason for a filter on the return line as it is the closest point to the transmission before filtered oil enters the system. Engine oil filters are connected directly to the pump so taht only filtered oil reaches the moving parts of the engine. If the oil filter cannot handle the high oil temperatures maybe it is the wrong unit for the job. REmember when the engine is stopped all tem,peratures even out so cooler temperatures rise to the higher temperature beforew the oil cools down

  • analytica84 Feb 09, 2014

    You make some very good points. Thank you.

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How to remove radiator on 2000 Lincoln Continental


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15. Position jackstand aside and carefully remove radiator and fan shroud.
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89116492

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84936658

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84942881

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89116496

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84942883

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84972057

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84942883

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84972056

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I Hope you Find this Helpfull And Please Remember to RATE ME

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  8. Disconnect engine control sensor wiring (12A581) from the auxiliary electric cooling fan motors and the CCRM.
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