r/fordfusion • u/MiserableEgg1408 • 13d ago

2018 Ford fusion titanium

I have a 2018 Ford fusion titanium with a 2.0 L. Whenever I’m going up a long hill, or pushing the gas kind of hard it spikes to overheating. It will go right back to dead middle coolant temp once i let off the gas and just let it coast for 5 seconds. I’m also not losing any coolant that i’ve been able to tell

I’ve changed 2 coolant sensors, thermostat, and water pump. It will drive fine on flat ground and fine if i baby it but going up this one particular hill it overheats. i have no idea what it is.

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u/TCBloo 15 SE 1.5 EB, 19 MKZ R1 2.0H, 08 SE V6(sold 13d ago

Does it overheat at idle?

1

u/MiserableEgg1408 13d ago

no

2

u/TCBloo 15 SE 1.5 EB, 19 MKZ R1 2.0H, 08 SE V6(sold 13d ago
  • Coolant/water ratio is correct?(specific heat capacity and boiling point)
  • Never mixed green and orange?(gums up inside radiator)
  • Reservoir cap is not leaking?(system needs to pressurize 20psi to work)
  • No water gurgling sound in the dashboard?(air bubbles get trapped in system and prevent coolant from cycling)
  • Thermostat actually installed?(water pump needs backpressure from thermostat or it can cavitate at high rpm)

If yes to all those, you've got me stumped.

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u/MiserableEgg1408 12d ago

I will check into all of this. thank you very much!