Hi good morning
i been having this problem of overheating but only happens when i go over 65mph uphill on the fwy with ac on, fans are working just fine
the radiator and thermostat are brand new, but overheating still happening.

 

Carlos one thing that causes what you're experiencing...your thermostat, just because it's new doesn't mean it's functioning correctly. Chances are good it's not opening 100% thus the overheating when your system is put under stress...happened to me! Assuming you didn't install radiator and thermostat yourself, take it back letting them know what's going on...Gary

 

Thank you Gary,
I'll take it back to my mechanic to double check on that!!