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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 972 (Engine Cooling System) >> Diagnostic Information and Procedures >> Low Engine Coolant Indicator Always On >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Circuit/System Verification must be performed before performing the Circuit/System Testing.
  1. Ignition OFF, disconnect the harness connector at the coolant level switch.
  2. Install a 3A fused jumper wire between the signal circuit terminal and ground.
  3. Engine running, verify the low coolant indicator turns OFF.
    • If the indicator does not turn OFF, test the signal circuit for an open/high resistance.
    • If the indicator turns OFF, test the ground circuit for an open/high resistance.
  4. If all circuits test normal, replace the coolant level switch.
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