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Home >> GMC >> 1992 >> Forward Control 7.4 N >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> General Servicing >> A/C System General Servicing >> Back-Seated (Operating) Position
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Back-Seated (Operating) Position

This is normal operating position, and position used for connecting and disconnecting manifold gauge set. Stem is turned fully outward to seal the service gauge port.

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