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Home >> Mercury >> 1987 >> Topaz LS, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> EGR System >> Operation >> Temperature Vacuum Switch

Temperature Vacuum Switch

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The temperature vacuum switch is used to hold off EGR operation to provide better cold engine driveability. This switch contains a normally open bi-metallic disc which allows free airflow in vacuum line. When closed, it blocks airflow by sealing against an "O" ring.