I own a 2003 E320 which I purchased a year ago. I have noticed that
during the summer or now during the winter that when the temperature is
set in auto, that the fan motor is a bit too noisy. I override the fan
setting to a lower speed and that works OK. Problem is I loose the
automatic temperature feature.
Has anyone noticed the same problem ??
It has to do with the auto feature overrunning the fan speed and trying to
excessively increase or decrease the temp. The tempreature sensor is in the
roof by the mirror assembly. Because of its location the system can't sense
the interior temp adequately in all conditions. The system thinks it's
hotter/colder in the cabin than it actually is and overruns the fan speed
trying to compensate.
The only solution is to point the center vents upwards, directing the air
flow to the sensor. If you do this it will quickly settle the system down,
reduce the fan speed, etc. Then you can adj the temp to whatever feels
comfortable. This is a "feature" of the old W210 climate control that has
apparently been transferred to the new E Class.
I must say, however, despite this one issue the W210 climate control is one
of the best auto systems I've experienced and very capable in extreme
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