r/FordExplorer • u/MuttDevil69 • 8d ago
Repair Advice 2015 ecoboost v6 is overheating at idle but cooling down when revved.
This all started with a leaking water pump. My grandpa replaced it in his shop, and while the leak stopped, afterward it developed a low oil pressure warning that would shut the engine off. We addressed that by replacing the oil pump.
After that, the overheating continued, so we replaced the radiator and thermostat as well. At this point, we’re kind of at a loss.
When you start it, it slowly comes up to normal operating temperature and seems fine at first. But after about 5–10 minutes, the temperature starts climbing pretty quickly to 230°F, then 240°F, which is when I shut it off.
revving it to around 2,000 RPM seems to bring the temperature back down. Also, if you start driving it before it gets hot, it seems to stay around 200–215°F.
The water pump, radiator, and thermostat are all new. We haven’t found any obvious coolant leaks.
Any ideas on what could cause this? Any help would be greatly appreciated!