Thread: A/C dash blower kept running non-stop-2001 E240
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Old 03-24-2006, 11:30 PM
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DR.DIESEL DR.DIESEL is offline
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Join Date: Mar 2003
Location: Puget Sound, Washington St.
Posts: 522
Like MB DOC said way back when, the blower regulator is it's own solid state
control unit that can fail. It will run away on it's own when it fails.
It is powered directly via a 16mm circut 30 power wire with a 200 amp crash fuse. The distribution block (X4) that it connects to is under the driver's carpet below the gas pedal on a left hand drive car.
If you want to stop it from running, unplug the regulator at the blower fan.
Disconnecting it upstream will kill your igntion switch and traction control
power supplies as well.
The stepped voltage from the head unit it the control voltage for the
regualtor to dictate needed fan speed.
Your voltages are right in spec. You 99% need a new blower regulator
unit.
Regards,
DR.D
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