308C Excavator Electrical and Electronic System – Engine Coolant Temperature Gauge Reads High or Ga

Problem: The engine coolant temperature gauge indicates a high level or the engine coolant temperature gauge pointer quickly extends beyond operating range.

Solution: Check that the following connectors and components are connected properly: “CONN 40”, “CONN 46” and “CONN 51”. If the problem still exists, use the following procedure to troubleshoot the system.

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Schematic for “Engine Coolant Temperature Gauge Reads Low or Gauge Does Not Move” and “Engine Coolant Temperature Gauge Reads High or Gauge Quickly Moves Beyond Operating Range”