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 MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 25 (ENGINE COOLING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL OUTPUT CONTROLS
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Scan Tool Output Controls
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Scan Tool Output Controls
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Scan Tool Output Controls
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Fan Relay 1 | Cooling Fan | Commands the FAN LO relay ON and OFF. Both cooling fans will activate on low speed. |
| Fan Relays 2 and 3 | Cooling Fan | Commands the FAN CNTRL and FAN HI relays ON and OFF. The driver side fan will be OFF. The passenger side fan will activate on high speed. |
| Fan Relays 1, 2, and 3 | Cooling Fan | Commands the FAN LO, FAN HI, and FAN CNTRL relays ON and OFF. Both fans will activate on high speed. |
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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.