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#1
12-26-2006, 01:32 PM
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ML transmission- Help please!
Hi All-
I was driving in for the holidays when I noticed a large cloud of white smoke come out of the rear of my truck. (2000 ML430) I immediately pulled off the interstate to have a look, and the bottom of the ML was covered in fluid- checked oil, pwr steering, - both were fine. Truck drove and moved fine- no slipping, strange noise or other indication of anything being wrong. If I had been driving at night, I would never have known anything went wrong at all. Looks as though it came from the transmission- didn't want to risk anything, so called tow truck and had it towed to a good indie about an hour away, he looked at it today and said that they could not find any leaks coming from the transmission but it looks as though it came from the top. He doesn't have the dipstick to check, but seems to think that the last time the trans was serviced that it was overfilled, and that it just vented the excess. Trans was dealer serviced (fluid and filter change) at 60k. Current mileage is 86k. I'm kind of lost here. If my trans was overfilled, wouldn't it have vented before this?? What is on the top side of the trans that could have failed- brake/shift cable or electrical connector? I really don't want to risk an out of warranty trans replacement. Any help appreciated. I am having the truck towed across town to the dealer to have the level checked and replenished if necessary, and to see what they can find, but the local dealer is not known for their great service dept., and I don't want to get hosed. Unfortunately I don't have any other options.
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2000 ML430 86k 2000 C280 Sportline 100k '86 420 SEL 178k '91 Audi 100 179k '88 BMW 750il 167k '83 300 SD 167k (sold) '79 300 D 78k (sold) 
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#2
12-27-2006, 08:20 AM
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Quite a few GOOD indies(MB shops) in that area!
Sounds to me that the trans has been either overfilled for a long time...OR a transfer of antifreeze into the trans.. I would make sure that the trans cooler & lines Don't have any signs of antifreeze. The radiator might be allowing antifreeze into the transmission & that could be causing the trans fluid to escape.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
12-29-2006, 02:08 PM
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What if: your radiator cooler lines
Quote:
Should the transmission cooler lines corrode and leak antifreeze in the transmission would anyone recommend purchasing a small and seperate auxillary radiator (and plug the original corroded lines) for the the transmission cooler lines or rather simply repair and replace as per the factory status quo/original status? Last edited by Smith007; 12-29-2006 at 02:10 PM. Reason: addition
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#4
12-29-2006, 01:12 AM
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This is not exclusive to Mercedes, most all ATs will dump oil if the following occurs:
Often, an overfilled trans will go for many months and miles without burping. But driving on a long uphill grade will get the trans heated up to the point where it will expand the oil enough so that it makes contact with the rotating mass inside the trans. Then you get foaming and the level rises rapidly until an overflow via the vent on top of the transmission occurs. This usually a one time affair as the level drops until aeration stops and the level then stabilizes. Another possibility is the trans filter has worked loose over time and it is alllowing the trans pump to suck air. This will have the same effect as above, though the condition will likely continue until you have lost a lot of oil. Jim in Phoenix Quote:
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