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Home >> Ford >> 1981 >> Econoline E150, Van Display Extended, 4.9L Eng VIN E, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> MCU Engine Control System >> Operation >> Engine Sensors >> Coolant Temperature

Coolant Temperature

Various switches are used to signal temperature changes to the MCU. On 6-cylinder engines, a PVS sends vacuum to an electrical switch (mounted with 3 others) which is open when vacuum is applied.