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Old 07-04-2010, 10:23 PM
whunter's Avatar
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,357
Bad trans = overheating engine

This is a slow and often overlooked cause of engine overheating.

A slipping automatic transmission generates excess friction heat.
The transmission cooler is inside the radiator on most Mercedes.

There is some excess cooling capacity on a perfect vehicle.
As the internal transmission friction progresses from minor through major to critical, it finally exceeds total cooling capacity.

The generic ideal operating temperature for automatic transmission fluid is between 175 and 225 degrees Fahrenheit.
You can check the general health of your transmission with an infrared thermometer at idle in park after a fifteen minute warmup drive.
Get temperature readings from both transmission cooling lines.


Last edited by whunter; 07-12-2010 at 01:10 AM.
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Old 07-15-2010, 12:11 AM
PanzerSD's Avatar
Join Date: Jan 2006
Location: Saskatchewan Canada
Posts: 2,351
Oh no.... I'm having inexplicable overheating probs, I'll check that right away! Thanks!!
RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)

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Old 07-15-2010, 01:49 PM
whunter's Avatar
Join Date: Dec 2003
Location: Metro Detroit, Michigan
Posts: 17,357

You can use a transmission cooler kit as a diagnostic tool, and/or to reduce engine heat load + extend the transmission life.
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