My corolla temp will gradually go up while driving and then come back down on its own while driving. The heater is not working. Blowing cold air. We have replaced the water pump, thermostat, and temperature sensor plug. Radiator is not clogged. All hoses seem fine. We are out of ideas.

  • Coolant level? Air lock?
    – Solar Mike
    Mar 7 at 7:33
  • Welcome to Motor Vehicle Maintenance & Repair! Mar 7 at 13:07

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