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Home >> GMC >> 1987 >> Forward Control 6.2 J, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 34 (A/C-Heater System - Manual) >> Components & Functions >> Constant Run Relay
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Constant Run Relay

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On models so equipped, engine idle quality is maintained by this relay. It eliminates compressor cycling during engine idle for a pre-determined time after vehicle has come to rest from road speed. Relay is controlled by ECM and engine sensors.

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