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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Controls - System/Component Tests) >> Emission Systems & Sub-Systems (Gasoline) >> Thermostatic Air Cleaner >> Damper Door Wax Pellet Check (Except 2.8L)

Damper Door Wax Pellet Check (Except 2.8L)

WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 1992 Pontiac Trans Sport, 1992 Oldsmobile Silhouette, 1992 Oldsmobile Bravada, 1992 GMC Yukon, and 1992 GMC Vandura Special. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove air cleaner assembly from vehicle and allow to cool to less than 40°F (4°C). Damper door should be closed to outside (cold) air.
  2. Reinstall air cleaner assembly. Start engine and observe damper door. As air cleaner assembly warms up, wax pellet should expand, closing off hot air delivery and opening cold air delivery.
  3. If door does not respond as indicated, ensure door is not binding and calibrated damper spring is installed properly.
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