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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) >> Fuel Evaporation Control (C-3) >> Thermostatic Vacuum Switch

Thermostatic Vacuum Switch

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. With engine coolant temperature less than 100°F (38°C), apply vacuum to manifold side of thermostatic vacuum switch. Switch should hold vacuum.
  2. With engine coolant temperature greater than 122°F (50°C), vacuum should drop off. If thermostatic vacuum switch fails either test, replace switch.
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