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Hello
I have actually an issue with my E63s , transmission oil temperature raise do 120C° under normal load.
Temperature raise more on trafic drive.
I saw this issue was covered a lot here.
Rear main seal changed by dealer 1000km ago, no issue since.
The second coolant reservoir (little one) on driver side was empty, fulled, drove 4--5km was empty again, and I put full again, total 2liters
Can't see any leak under the car or in engine compartement
Front radiator have some impact, and he have protection grill.
I check with diagnostic tool, there aren't any fault. But I managed to test the 3 auxiliary pump with it
All worked when actuated, but one seems to have power issue, according to test
Can this auxiliary pump cause transmission oil overheating ?
I can't see any leak, can't understand why this secondary coolant reservoir was empty
Yes that was me, according to the Mercedes dealer that fixed the issue when my car overheated after having RMS replaced, the shop that did the repair forgot to plug in the auxiliary cooling fan (blows air to cool the transmission cooling radiator??) and they also forgot to bleed the auxiliary cooling circuit for the transmission, which I have read is difficult to bleed 100% the first time (requires multiple heat cycles to top off the fluid 100%)
Maybe try driving the car again since you've topped off the auxiliary reservoir again and see if transmission temp gets high, I think it should stay somewhere around 76 to 88 celsius under normal conditions, if it gets above 98 celsius and doesn't start to come back down then the problem still exists
Last edited by Rover338; Jan 28, 2024 at 06:10 PM.
Some news concerning my problem, first , problem solved
I changed this auxiliary pump, but still same problem
I gave back the car to dealer to check what they have done during RMS replacement
They keep the car 2 days, they says all ok, bleeding is ok, vacum test done no leak, they quote me replacement of front radiator
I refused, because it's non sense, to replace it if vacum test is ok
I tried again to bleed (auxiliary cooling) , I launched procedure 4-5 times
After 5 times, AMP of auxiliary pump became normal 6.0 A
THen I tested, pushed the car, run in trafic etc,, now transmission oil temperature is not exceed 80C , it's all ok
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