2017 3.5 Eco Overheating
 

Hi guys and girls,
I have a problem that I wanted to get some input on. I took my 2017 3.5 Eco in for oil change and they said it was time for a coolant change. I know now that it really didn't need it since it only has 40000 miles. Ever since then on the highway it runs between 225 - 240 degrees not pulling a trailer and running about 75 mph. I will probably take it back in, but if it is something relatively simple I would rather not. The coolant tank is full and I tried the open the cap and let the coolant circulate and then tighten it back up. Thanks for any help.

Don't loosen the Cap on coolant jug its under 21psi you could get burned,have dealer check the Temp of the coolant going into the Radiator (Bottom hose) and the top hose going back into engine with a temp Gun the coolant should be cooler coming out some radiators have been known to have debris or sand castings causing it to be clogged have them check the Thermostat and check the function of the Active Shutters if you remote start it when cold they will cycle closed and open,you have shutters for the Radiator and the inter Cooler for the Turbos, Last but not least have them Pressurize the cooling it should hold the 21 psi if not there is a leak.

Ok, thanks for the tips.
I think I will take my infrared thermometer to check it before I take it back. Looks like they will have to do the diagnostics.

If it was fine before the flush I'd suspect you likely have an air pocket somewhere.

RX1Cobra is correct... a number of Ford engines require a few handfuls of hot/cool cycles to get rid of air in the system, and some even require extra steps beyond that. My 2003 Escape required jacking up the front end about 2ft just to get the process started. One cycle with it jacked (let it cool for ten minutes while raised), then it would suck in the rest of the coolant over 8-10 more cycles.

Was this service performed at a Ford dealership? I'd check that compatible coolant was used, and if it was changed, use only a Ford oem thermostat, or second best case, a Stant.

This coolant system auto bleeds itself, so i'm not so sure that's the case.

RX1 and Flaming, I have been driving it for about 2 weeks with plenty of cycles. It should have all the air out by now.

I just took it to the dealer. I checked for codes earlier in the day and there were none. They checked it out and said they cleared an overheat code. So I got in it and headed back home and ran it up to speed a couple of times. It started overheating again ~235 degrees. I took it back and they gave me a loaner car so they can check it out again. I will report back on what they find.