GLS Class (X166) Produced from 2016 to 2019

Transmission Fluid Leaking help

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Old Sep 15, 2025 | 09:53 PM
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Mercedes GLS
Post Transmission Fluid Leaking help

Hi all,

I have a question about my 2017 GLS 450. A while ago, I noticed that there was leaking from bottom of the vehicle near the front passenger. I sent it to the shop and they said they the transmission cooler lines are leaking and need to be changed. I changed the upper and bottom lines, then flushed the transmission fluid. Then, when I get it back, it looks like the leaking is even worse (it used to drop literally one drop after I park. After the repair, it drops like 4-5 drops after I park). I brought it back to the shop, they mentioned that the radiator port is leaking and would ask me to replace the radiator, which costs a lot. I brought the car back and thought to take a look at it myself. So I tried to clean the bottom of the car, then let it run for a little, then came back and saw. It seems that the leak comes from the lower right corner of the radiator on the passenger side, but when I touch the connector, it seems clean to me. I'm not sure what other possibilities there are. I took some photos. Any help would be much appreciated!

BTW, i noticed that when I accelerate from stop, and when it goes from 2nd gear to 3rd gear, sometimes there is a slip in the transmission. It doesn't happen a lot, but it does happen, especially when I hit the gas pedal hard. I suppose it is a sign of low transmission fluid?

Thank you!

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