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Home >> Ford >> 1994 >> Probe Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (A/C-Heater System - Manual) >> Operation >> System Controls >> Function Selector Knob
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Function Selector Knob

WARNING: This page is about a different car, the 1994 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

The function selector knob actuates a 6-port vacuum selector, which controls air source intake and air distribution within system. The function selector knob also controls blower on-off switch and A/C compressor clutch operating circuit.

Actual turning on and off of compressor clutch is dependenton function selector knob and clutch cycling pressure switch. Both switches must be closed to energize clutch for compressor operation. The following function selector knob settings affect air distribution:

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