Yukon 4WD V8-6.5L DSL Turbo VIN S (1997)
Radiator Cooling Fan Motor: Initial Inspection and Diagnostic Overview
1. CHECK Vehicle Control Module DTCs that may affect system. If any Driveability DTCs are set, Refer to Engine Controls. See: Powertrain
Management/Computers and Control Systems
2. CHECK condition of A/C COMP Fuse and AUX FAN Fuse. If either Fuse is open, LOCATE and REPAIR source of overload. Replace Fuse(s).
3. CHECK that Ground G112 is clean and tight.
4. CHECK that the Auxiliary Cooling Fan Relay is securely mounted in its socket.
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CHECK for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove "GOOD" in a
Continuity/Voltage check with a system disconnected. These Circuits may he intermittent or resistive when loaded, and if possible, should be
checked by monitoring for a Voltage drop with the system operational (under load).
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CHECK for proper installation of aftermarket electronic equipment which may affect the integrity of other systems (Refer "Troubleshooting
Procedures"). See: Diagrams/Diagnostic Aids
