High Cylinder Head Temp - Not Overheating?

• There are no leaks.
• Oil is fine
• Mechanic couldn't find anything with pressure test.
• The H and C is normal (which is weird because its a fake reading that's based off the high CHT)
• Oil temp is perfectly center in the green.
• Radiator fan turns on when with the AC off and it seemed at around 206-208 F
• Radiator fan also turns on with the AC on.
• Radiator fan will not shut off or cool the car down after it hits a CHT of 216-220 F.
• The heat works fine, AC works fine.
• Not that this matters, the radiator hose feels warm even when the CHT is above 220 F
• I took an infrared temp of the radiator after the car was running and the upper was showing 170F while the top right, bottom left, bottom right had a temp of 77F

gkomo said:

Is 77 degrees normal on the ‘outgoing’ side of the radiator? Would make it seem as though the radiator is doing its job. Fan is actually pulling air through nicely?

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Noobz347 said:

So, this could very well be normal operation and you're [looking] for issues to address?

If you're not throwing a code, press on with pride.


235* is within normal operating temp. Idle after heat-soak is when you [would] see it creep up. E-Fans don't move the same air as car moving, even at 30 MPH.

If anything (and I'm not saying that this is), I might do a radiator flush (if you didn't do it with the pump change), and spray some "Gunk" on the radiator fins and flush out with [low pressure] water from a garden hose.


Something else you can try just to ensure: Turn your A/C on while at idle and check to see that both fans turn on.


Neither of these things mean anything.




It's based off of the Engine coolant temp sensor.

Motorcraft CX2409​

(Ford Part Number: DY-1149)

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