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Home >> Mercury >> 1976 >> Capri II Base, 2.3L Eng, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Thermostatic Air Cleaner >> Testing >> Vacuum Motor & Valve Assembly

Vacuum Motor & Valve Assembly

  1. Duct valve should be open when engine is off. Start engine. Valve should close during engine idle, unless engine has reached normal operating temperature.
  2. If engine is cold and valve does not close during idle, check for disconnected vacuum lines to vacuum motor, cold weather modulator valve, and bimetallic sensor.
  3. Check bimetallic switch to see that bleed valve is closed. Rapidly open and close throttle. Valve should open if temperature is above 55°F (13°C) during throttle opening. If valve does not function properly, check for binding or replace.
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