DOC-1033678
Service Bulletin/Repair Instructions
CAT 3126 - Engine Fan Wiring Diagram
Vehicle report
Technical service bulletins are instructions a manufacturer sent its dealers about a known fault. They are not recalls and the work is usually not free, but they are the clearest signal of a problem the manufacturer already knows about.
DOC-1033678
CAT 3126 - Engine Fan Wiring Diagram
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.