Good point on the air.

Nitrogen seems to be the choice of the professional.

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2012 E350
2006 Callaway SC560

Here is a step-by-step method to test compressor cut-off. http://www.peachparts.com/shopforu...=158591&page=5

Note this is for a 87 diesel, so one value is different, but let us know what you find on the basic tests.

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Saumil S. Patel

An update.

Replaced the compressor & the receiver drier.
The A/c has been blowing cold since then.
Hopefully it will stay like that for a long time.

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300CE 1989 Euro Model.
ML350 2011.