My W210's AC compressor isn't engaging. Couple months ago, I removed the AUX fans, AC condenser and radiator. I never hooked the auxiliary fans up because the housing that they sit in was old deteriorated and cracked plastic. I haven't ordered that part as I can't find the part number. I went to go turn on my AC and noticed the compressor didn't engage. I "topped" off the system because of my evaporator leak. I have plenty of R134 according to gauges and have a new evaporator temp sensor and the compressor was replaced about 30k miles ago by the PO. No it isn't overfilled and just within range.

Can the compressor engage without the AUX fans installed?

Run through ACC panel diagnostics to look for codes - https://youtu.be/8iaZZU3tmio

Sixto
98 E320s sedan and wagon

I had codes. Cleared them and still compressor isn't engaging

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

The CCU checks the resistance of the aux fan motor every time you turn on the AC. If it sees an open circuit on the aux fan it will not switch on the clutch and the code will immediately come back.

Separately, the AC clutch coil has a thermal fuse to protect the belt. If that thermal fuse is blown the clutch won't engage. Read the codes and fix the problem before clearing them.

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CENSORED due to not family friendly words

Thanks TJ. The codes that were present were from a faulty evaporator temperature sensor that I replaced. I'll check that fuse if it doesn't engage after I install the fans.

__________________
Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k