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Home >> GMC >> 1988 >> Forward Control 6.2 J, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Air Cleaner - Thermostatic >> Component Testing >> Wax-Pellet Actuated

Wax-Pellet Actuated

  1. Remove air cleaner assembly. Cool air cleaner below 40°F (4°C). Integral air door should close off cold air inlet. Ensure gasket between air cleaner and throttle body injection unit is okay.
  2. Install air cleaner. Ensure heat stove tube is connected between air cleaner and heat shroud. Start engine. As air cleaner warms up, integral door should slowly open to allow cold air to enter engine.
  3. If air cleaner does not operate properly, ensure integral door is not binding. Ensure calibrated spring is properly installed. If door and spring are okay, replace wax-pellet actuator.
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