Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1997CHEVY EXPRESS G3500, VAN CARGO, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 46 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - 7.4L)MISCELLANEOUS ECM/PCM/VCM CONTROLSCOOLING FAN (C-12)COOLING FAN RELAY
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 F
Cooling Fan Relay
1997 Chevrolet Chevy Express G3500, Van Cargo, 6.5 FSECTION Cooling Fan Relay
WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 1995 GMC Vandura Special, 1995 GMC Vandura, 1995 GMC Suburban, 1995 GMC Rally Camper Special, and 1995 GMC Rally. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect cooling fan relay harness connector. Using an ohmmeter, check continuity of relay winding. See Figure - Figure . Continuity should exist. Check continuity across power delivery terminals of relay. With relay not energized, continuity should not exist.
- With ohmmeter still attached to power delivery terminals of relay, apply battery voltage and ground to energize relay winding. Continuity should now exist between cooling fan relay power delivery terminals. Replace cooling fan relay if continuity does not exist.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.