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Home >> Ford >> 1998 >> RV Cutaway Custom, 7.3 F >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heater System >> Testing >> Function Selector Switch

Function Selector Switch

Place function selector switch in specified position. Using a vacuum gauge, check for presence or absence of vacuum as specified. See Figure. If test results are not as specified, check for kinked or broken vacuum lines. If vacuum lines are okay, replace function selector valve.