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Home >> Mercury >> 1985 >> Cougar LS, 5.0 F >> Repair and Diagnosis >> Engine Performance >> System >> EGR System - Gasoline >> Operation >> Temperature Vacuum Switch
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Temperature Vacuum Switch

Switch has a normally open bimetal disc which allows free air flow in vacuum line. When closed, it blocks air flow by sealing against an "O" ring. It is used to hold off EGR to provide better cold driveability.