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HOMESERVICE MANUALSCHEVROLET2010CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISBODY & FRAMEFIXED AND MOVEABLE WINDOWS SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESREAR WINDOW DEFOGGER MALFUNCTIONCIRCUIT/SYSTEM VERIFICATION
2010 Chevrolet Chevy Express G3500, Van Passenger Extended

Circuit/System Verification

2010 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Verification

Ignition ON, command the rear window defogger ON and OFF by pressing the rear window defogger switch. The rear window defogger and rear window defogger indicator should turn ON or OFF each time the rear window defogger switch is pressed.

  • If the indicator does not turn ON or OFF with each switch press, replace the HVAC control assembly.
  • If a rear window defogger grid does not turn ON and OFF when changing between the commanded states, refer to Single Rear Window Defog Grid Malfunction below.
  • If both rear window defogger grids do not turn ON and OFF when changing between the commanded states, refer to Rear Window Defogger Malfunction below.
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.