Vehicle category: heavy trucks; ford, international harvester and volvo whitemodels equipped with caterpillar 3208 or detroit diesel 8.2 liter engineseries.system: engine cooling; fan assembly (durocool) 91704; replacement part.consequences of defect: a fatigue crack in the blades may occur and portions ofblades may separate from the fan without warning. Risk of damage to enginecompartment and personal injury could result.