Century, Grand Prix, Impala, Intrigue, Lumina, Monte Carlo, Regal 2001-2005

Testing

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"Low Coolant" Indicator Off, Coolant Level Low



  1. Disconnect the engine coolant level indicator module at the radiator.
  2.  
  3. Place the ignition switch in the ON position.
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  5. Connect a 3 Amp fused jumper between the engine coolant level indicator module terminal B and ground.
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  7. Is the "Low Coolant" indicator ON-
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  9. If the indicator is still ON, connect the fused jumper between terminal B and terminal C (the ground wire, usually black with a white tracer). If the indicator stays ON, check the module terminal C for a poor connection. If okay, replace the module. If the indicator is OFF, check the coolant module terminal C for a poor connection. If okay, look for an open in the circuit between the coolant module and its ground connection, at the flywheel end of the engine.
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  11. If, after jumping terminal B and C together, the indicator is now OFF, look for a bad connection at the instrument cluster, an open in the circuit between the coolant level module and instrument cluster connection and/or also a possible bad bulb or bulb connection.
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"Low Coolant" Indicator On, Coolant Level Ok



  1. Disconnect the engine coolant level indicator module at the radiator.
  2.  
  3. Place the ignition switch in the ON position. Check if the "Low Coolant" indicator is ON.
  4.  
  5. If the indicator is no longer ON, replace the coolant level indicator module.
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  7. If the indicator is still ON, check the circuit for a short to ground, between the instrument cluster connection and the module connector terminal B (usually a yellow/black wire, to instrument cluster).
  8.  
  9. If the circuit is okay, the instrument cluster may need to be serviced.
  10.  

 
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