I'm at work and don't have the 126 CD-Rom with me, so I can't comment about low/high side pressure.
The system is designed to shut off the A/C compressor if the serpentine belt is too loose. Check out your serpentine belt tension.
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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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