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Thread: Which transmission line is the pressure line?

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    wh23g3g's Avatar
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    Default Which transmission line is the pressure line?

    Is there an easy way to tell which transmission line is the pressure line? I just changed my a/c condenser and instead of removing the radiator I just unbolted it and moved it back enough to get the new one in. Now when I start it up the trans temp and o/d light come on, sometimes they just stay on for a second after the bulb checks and then go away. I had this problem a couple years ago and this is the first time it's happened for probably 2 years. I'm wondering if that drain back valve is a problem when I was moving the radiator back. Isn't it in one of the rubber lines at the bottom? I've got the factory auxiliary cooler. I need to figure it out because one of them is leaking too. I didn't have time to drive it after I recharged the a/c system. I plan on doing it tomorrow. I know my transmission lines need attention. They are original and looking a bit stressed at the rubber ends. Where is this anti-drain back valve? Is inside the rubber hose or is it a fitting? The manual explains what it does but doesn't show it. It just says it's in the cooler outlet (pressure) line near the radiator tank.

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    If iirc looking at the trans from the driver side, the pressure line is the forward line and the rear line is the return. I will take a look tonight and try to get back with you
    99 RT Fully built 365


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    I looked at my lines going to the auxiliary cooler tubes on the radiator. The oem part numbers on them appear to match the oem numbers of a 1998 Dodge Dakota R/T. Mine is definitely a 1999 built in October of 1998. One had part number of 52028784AD which a crimped end turning to a rubber hose, the other one had part number 52028782AE with a threaded on connection changing to a rubber hose up to the copper radiator cooler lines. According to the factory parts manual in 1999 both the return and pressure line should be the same part numbers. It appears to be leaking at the threaded portion where it changes to a rubber line. However, I see that neither one is still available. I was wondering if I get one from a Durango, Dakota, or Ram that uses that short threaded rubber line will it work. I'm not sure which hose has the drain back valve in it.

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    Quote Originally Posted by 99lowdakota View Post
    If iirc looking at the trans from the driver side, the pressure line is the forward line and the rear line is the return. I will take a look tonight and try to get back with you
    Your recollection is correct. Return is at back of tranny.

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    Honestly if you just cut those rubber lines off and do a small flare on the end of the hard line then put some rubber line over the tube with 2 hose clamps and run them to the cooler. It will be just fine and not leak on you. That is what most people do. But; if you really want to get fancy you can buy an AN flare tool and cut those lines, put AN nuts on the end of the line and run AN lines up to the cooler. Thats what I did on my Cummins
    99 RT Fully built 365


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