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Home >> Pontiac >> 1979 >> Phoenix Base, 2D Hatchback, 3.8L Eng VIN A, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Computer Controlled Catalytic Converter >> Operation >> Engine Sensors & Switches >> Engine Coolant Sensor

Engine Coolant Sensor

This switch determines engine coolant temperature and sends a proportionate signal to the ECM. It does not allow C-4 system operation while engine coolant is below 90°F.

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