Transmission Tunnel Getting HOT - Mercedes-Benz Forum
 
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post #1 of 5 (permalink) Old 07-09-2019, 10:45 AM Thread Starter
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Transmission Tunnel Getting HOT

So here goes. My dad's 2008 S550 4MATIC has just been with us on a roadtrip. Our first destination was around 800 miles from home and I didn't notice the center console heating up too much.

But on the 2nd round, the car was feeling extremely heated after the 600 mile trip. I turned on the AC to low in the rear and it was blowing hot for 10mins after starting.

Even after cooling the air down it would heat up again for some time and cool down.

No error lights have shown up and this car is meticulously maintained at our local Mercedes Dealer.

Should we take it in just in case? I'm sure this is normal after a transmission has been running for a couple hours straight.

The engine coolant temps also held very steady throughout the trip if that helps.

Thanks all.
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post #2 of 5 (permalink) Old 07-09-2019, 01:52 PM
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I would absolutely have the drive train checked; and the intercooler for the transmission, if the car has one.

Warren

2013 S550

Formerly:
2010 S550
2005 S500 4-Matic
2000 S500
1978 450SL
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post #3 of 5 (permalink) Old 07-09-2019, 09:05 PM Thread Starter
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Just as I suspected... I was definitely thinking transmission oil cooler. Some other things to note are the air will heat up and cool down periodically.

As in, even on LO in the back it'll come out burning hot and then cool down.

Another random thing I noticed was vibrations at higher and lower speeds, that may be a drivetrain issue.

Hopefully we can take the Stallion in soon and get her checked out. I'll update with anything I find.
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post #4 of 5 (permalink) Old 07-10-2019, 06:48 AM
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The vibration may be a drive train issue, or it could be tranny and motor mounts; a bad flex disc; a bad 4Matic transfer case; or other problems. Please don't delay getting it checked.

While not from a W221, this link illustrates what damage a failed flex disc can do - https://www.benzworld.org/forums/r-c...disc-info.html

My thinking is that while a transmission oil cooler would be the most likely cause, and a problem with the transfer case second, the remaining items can cause a misalignment in the drive train components, which can cause excess friction and overheating.

We will be most interested in what you find.

Warren

2013 S550

Formerly:
2010 S550
2005 S500 4-Matic
2000 S500
1978 450SL
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post #5 of 5 (permalink) Old 07-11-2019, 05:03 PM Thread Starter
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Same here. Unfortunately we don't have time to bring it in this week so hopefully we can bring it in next.
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