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  1. D

    Irradic Temperature Guage

    Changed the water pump. All is well. I played with the old pump and found no defects. Metal fins.
  2. D

    Irradic Temperature Guage

    I measured the engine temp at various places. Registers 159-180. Coming out of the radiator it is ~100. Going into the radiator is ~180. I am confident that this is primarily happening under speed (70mph). But even accelerating to 50mph shows the gauge move.
  3. D

    Irradic Temperature Guage

    The dash gauge will hit H which causes the AC to turn off. But I don't feel any cylinders turning off and entering limp mode. It only stays on H for a few seconds before returning to the nominal temperature. The engine fan is running hard occasionally but not always. Where would I measure the...
  4. D

    Irradic Temperature Guage

    Very helpful gents. Thank you. Which of these is the correct temp sensor and can I replace it/them without major work? Duralast Coolant Temperature Sensor SU8781 Part # SU8781 SKU # 631220 Notes: Coolant temp sensor Duralast Coolant Temperature Sensor SU8756 Part # SU8756 SKU # 631221 Notes...
  5. D

    Irradic Temperature Guage

    Seems to happen mostly when AC is running. Could the AC be requiring more torque than normal?
  6. D

    Irradic Temperature Guage

    Drive belts look good. Maybe they need to be re-tensioned?
  7. D

    Irradic Temperature Guage

    I was not planning to do the work myself. Does the temp sensor feed the thermostat in that it measures the temperature and tells the thermostat to open and close?
  8. D

    Irradic Temperature Guage

    Are you saying the sending unit is the likely culprit?
  9. D

    Irradic Temperature Guage

    The garage said they flushed the system when they changed the radiator. In summary here is the work that was done: 1) Coolant Crossover replaced 2) Thermostat replaced 3) Radiator Replaced and new coolant What else could be the issue?
  10. D

    Irradic Temperature Guage

    It overheats at highway speeds. AC on. Engine fan turns on high. Heater blowing extremely hot. I am thinking a water pump fin broke off or sending until is faulty. Thermostat is brand new OEM.
  11. D

    Irradic Temperature Guage

    The shop pressure tested overnight. No leaks. And no visible leaks now as far as I can tell. The engine is showing hot on the gauge (see pics) sometimes under load but not always and only for a few seconds. The fan is running high after a 20 minute city commute but I don't see it overheating...
  12. D

    Irradic Temperature Guage

    Update: radiator was leaking at the seam. They popped in a new radiator and the leak is no longer happening. They did not find exhaust in the coolant so that rules out a head gasket leak. But... 1) the temperature gauge is still fluctuating during accelerating albeit drops to normal range after...
  13. D

    Irradic Temperature Guage

    Bought a used 2013 Expedition (XLT 2WD 5.4L). Noticed a small coolant leak underneath coming from middle of the vehicle. Garage thought it was the freeze plug which didn't make sense because the car never left the south US. They said it's fine to drive as long as you keep coolant in it. Drove...

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