Well here's where I'm at...I got 43 psi on the low side, so don't think I need a charge. I put the temp all the way to low and press these auto button and put the fan on max. The Compresser does not engage next I removed the connector to the receiver/dryer the connector has 3 connections I jumped the 2 outside pins. The compressed kicked in for 2 seconds and the controls in the cabin switched to the off position without me touching them. Any kind of help would be great.
Chris

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92 300sd w140