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Home >> GMC >> 1984 >> Cab & Chassis S15, 2.2 S >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - 2.2L Diesel >> Testing >> Glow Plug System >> Thermo Switch
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Thermo Switch

Continuity should exist when switch is at a temperature lower than 109-122°F (43-50°C). No continuity should exist when above 116-127°F (47-53°C). If switch does not operate properly, replace it.

Fig 1: Glow Plug System Wiring Diagram
G9764