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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls - 6.6L - Troubleshooting & Diagnosis) >> Fuel Heater Inoperative >> Component Testing

Component Testing

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  1. Remove the fuel filter/heater element housing from the vehicle.
  2. Connect the ignition 1 voltage circuit of the fuel heater to a battery voltage source and connect the ground circuit of the fuel heater to a ground.
  3. Cool the thermostatic switch of the fuel heater with ice.
  4. Observe the heating element.
    • If the thermostatic switch does not turn on the heater element when the temperature is between -8.4°C and +15.4°C (+16.9°F and +59.8°F) replace the fuel filter/heater element housing.
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