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Home >> GMC >> 1995 >> Forward Control 4.3 Z, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - 4.3L. >> Emission Systems & Sub-Systems >> Fuel Evaporation Control (C-3) >> Thermostatic Vacuum Switch

Thermostatic Vacuum Switch

  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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