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Home >> Chevrolet >> 1975 >> Hi-Cube Automatic Trans >> Repair and Diagnosis (Single Page) >> Engine Performance >> Tune-Up >> Transmission Controlled Spark System >> Operation >> Temperature Switch
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Temperature Switch

Temperature switch provides a path to ground for cold override feature. When engine coolant temperature is below 93°F, vacuum is allowed to reach advance unit. When engine coolant temperature exceeds 93°F, temperature switch opens, returning vacuum advance to transmission gear position control.