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Home >> GMC >> 1987 >> Forward Control 5.7 M, Standard >> Repair and Diagnosis >> Engine Mechanical >> Engine Cooling Fan >> Non-THERMO Control Fan >> Testing
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Non-THERMO Control Fan: Testing

If engine overheats during low speed or idle operation, increase engine speed to about 1000 RPM in Neutral. If condition is not corrected by increasing engine speed, replace fan drive unit. All units are non-adjustable.