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Home >> GMC >> 1990 >> Forward Control 7.4 N, Automatic, 400/M40 >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel - Standard & Electronic >> Description & Operation >> Coolant Temperature Warning System Operation >> Standard Panel (All Models Without Gauges)

Standard Panel (All Models Without Gauges)

Warning system consists of temperature switch and instrument cluster warning light. When coolant overheats, switch closes and warning light illuminates. Switch closing temperature is 257°F (125°C).

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