On my 95 S320, the AC compressor does not engage. I can turn both sides of the CCU to Lo, and still nothing. As far as I know, when I do that, the clutch should engage at any temp. Today when I looked at it, it was 8 degrees C outside.
I dont' know if this is related, but the instrument cluster isn't showing outside temp all the time. Happens intermittently.

Got 2 codes from the CCU when I checked. E045 and E075.
Is it possible that my R134a is just low, and that caused my E045 code?? How can I check the pressure if the clutch won't engage?? If I hook my AC gauges to it, which side does each line go to?? I have red, blue, and yellow lines. Yellow, I believe goes to the bottle I'm filling from, iirc....

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Too many people tip toe through life, never attempting or doing anything great, hoping to make it safely to death... Bob Proctor

'95 S320 LWB
'87 300SDL
'04 E500 wagon 4matic