BenzWorld Junior Member
Date registered: Feb 2009
Vehicle: mercedes A180 Auto diesel 2010
Location: telford uk
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Quoted: 0 Post(s)
Engine fan on all the time...thermostat ?
Yes so the sensor is working ok to give you a correct display.
I did have the same problem a few years ago but cannot remember if it was on the merc or Puma.
I replaced a temperature switch that had failed shut, which if fitted to your merc would be exactly the same.
Sorry I do not know if mercs work the same way.
Sorry I cannot be any more help.