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 MANUALSCHEVROLET2001CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 6.5 FREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 736 (ENGINE COOLING SYSTEM -- 5.7L)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL OUTPUT CONTROLS
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 F
Scan Tool Output Controls
2001 Chevrolet Chevy Express G3500, Van Passenger Extended, 6.5 FSECTION Scan Tool Output Controls
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
PCM - 5.7 Liter LS1
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Fan Relay 1 | Fan Relays | The scan tool displays a Commanded State of None, Off or On. This allows you to communicate with the PCM and activate or deactivate the cooling fan 1 relay, manually turning the low speed fans On and Off. |
| Fan Relay 2 and 3 | Fan Relays | The scan tool displays a Commanded State of None, Off or On. This allows you to communicate with the PCM to activate or deactivate the cooling fan 2 and 3 relays, manually turning the Right High speed fan On. |
| Fan Relay 1, 2 & 3 | Fan Relays | The scan tool displays a Commanded State of None, Off or On. This allows you to communicate with the PCM to activate or deactivate the cooling fan 1, 2 & 3 relays, manually turning both High speed fans On. |
RENDER: 1.0x
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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.