Small Transmission Leak

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Cadillac Seville / Cadillac Eldorado Forum Discussion, Small Transmission Leak in Past Cadillac Vehicle Discussion; This has been going on for quite some time now (several months) but it is finally getting to me. There ...
  1. #1
    JTraik is offline Cadillac Owners Enthusiast
    Automobile(s): '68 DeVille '95 FWB '99 Eldo '96 6BT Ram 5MT
    Join Date
    Mar 2004

    Small Transmission Leak

    This has been going on for quite some time now (several months) but it is finally getting to me. There is a very small collection of transmission fluid drips on the ground towards the center of the of the car and towards front of the engine. I am thinking it is running down from somewhere else and just finding the low point there at the center. Only happens if the car sits for hours after a long drive. Only seems to reoccur after another long drive and long sit. Not much fluid but enough to leave little, unsightly messes everywhere.

    The engine and transmission are not clean to the point where I am able to spot a "new" leak easily. However, I have performed a lot of recent work in this area for it to be possibly disguised as leftover leaks from previous issues. I did notice however that on top of the opposite side of the pan on the casting, on the drivers side towards front, there is a sensor threaded into the casting. Temperature sensor? It looks to be in rough shape and is oily. I replaced the radiator-to-transmission line that threads in directly above it. I ensured that the threaded portion of this line was secure and leak free to the trans. I had a leak there previously and it certainly dripped down to the sensor.

    The sensor doesn't look good but also notice there is possibly a quick connect trans line crossing over right above it. Do either of these commonly fail? How hard are they to get to if need be? I will have access to a lift in a week, input is appreciated!

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  3. #2
    vincentm's Avatar
    vincentm is offline Cadillac Owners Connoisseur
    Automobile(s): 1997 Cadillac Eldorado ETC
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    Aug 2010
    Kennewick WA
    Axle seal?

  4. #3
    Koooop's Avatar
    Koooop is offline Cadillac Owners Master
    Automobile(s): 300 SRT8, 392 cubic inches of tire smoking power!
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    Jan 2005
    So Cal
    Transmission fluid is quite flammable.

  5. #4
    maeng9981's Avatar
    maeng9981 is offline Cadillac Owners Connoisseur
    Automobile(s): 14 SRX, 00 SLS, 99 Deville 50-year Anniversary
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    Mar 2009
    Dallas, TX

    Re: Small Transmission Leak

    The trans fluid temp sensor is internal to the transmission. No wiring or physical sensor visible without disassembly. A good cleaning and inspecting would tell where it's leaking. If you post a picture of the sensor you're suspecting, it would be easier to tell what it is.

    But, I believe the cooler lines aren't the common leak points when it comes to Northstar cars, unless it was previously (incorrectly) serviced before.

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