Quote:
Originally Posted by rorypff
The EC switch is the econo switch for switching the aircon off - has nothing to due with low aircon gas.
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On many of the MB A/C systems, the system will go into EC mode if there is a fault in the system, be it low pressure (protecting the compressor) or a sensor fault. If the EC engages on its own, it's a sure sign that the system is faulting somewhere.