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Home >> Buick >> 1973 >> Centurion 2D Convertible >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Automatic Temperature Control >> Description >> Other Control Units >> Lo Relay
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Lo Relay

Mounted on firewall in engine compartment. Relay will be energized whenever selector control head in VENT or DEF, or when in-car temperature switch or engine thermal switch is closed. This allows blower motor to operate at low blower speed. It is possible for the lo relay to be energized whenever the ignition switch is on, but control head selector lever is in the OFF position.

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