Quote:
Originally Posted by tjts1
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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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.
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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
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