Mercedes-Benz Forum - View Single Post - 2013 C250 AC Compressor not being turned on by dash buttons
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post #2 of Old 05-31-2019, 09:38 AM
Join Date: Dec 2016
Vehicle: 1999 ML430, 2000 ML320, 2005 E500 4matic wagon
Location: Wisconsin
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If the battery was not disconnected during the repair then the system sensed the loss of pressure and went into protection mode.

It needs to be reset or have the protection mode turned off. You will need a scan tool that can handle MB specific code and resets.
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