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Home >> Jeep >> 1983 >> Pickup J20, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Spark Control System >> Testing >> Spark Coolant Temperature Override Switch >> Single-Function for Heavy-Duty Cooling
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Single-Function for Heavy-Duty Cooling

Connect a vacuum gauge to center port "D" of CTO switch. When coolant is below 220°F (104°C), carburetor ported vacuum should register. Above 220°F (104°C), manifold vacuum should be indicated.

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