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Old 07-04-2010, 10:23 PM
whunter's Avatar
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Join Date: Dec 2003
Location: Metro Detroit, Michigan
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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.



Transmission:
Transmission:

Last edited by whunter; 07-12-2010 at 01:10 AM.
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Old 07-15-2010, 12:11 AM
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Oh no.... I'm having inexplicable overheating probs, I'll check that right away! Thanks!!
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Old 07-15-2010, 01:49 PM
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FYI

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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