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I just purchased a used 2019 Expedition, with 54,000 miles, from the Ford dealership. No problems during the test drive, but after they did the final dealer prep, I drove it off the lot, got down the road about 1 mile and the dash displayed "Engine Coolant Over Temperature" and read 262 degrees! I immediately pulled over to the shoulder while my wife took a photo of the gauges and turned the engine off. Steam was coming out from under the hood. The dealer said to bring it right back if I could and they would take care of it. We were just a quarter mile from an exit, so after letting it cool for a few minutes, started it up and pulled off on a side road and popped the hood. There was no water in the overflow bottle! Luckily, we had 3 full 16 oz. bottles of drinking water with us. I put the water in the overflow bottle and loosely replaced the cap just a turn or two. The dash warning disappeared, the gauge was back to normal temp, so we drove back to the dealer. It's supposed to be ready to pick up today after they replaced the heater hose. Here's my question, do I need to be concerned that the temperature reached 262 degrees for a few minutes? Is there any chance of engine damage, want to know before I accept possession after the repair and drive home? HOW HOT CAN THE ENGINE GET BEFORE I WOULD HAVE TO WORRY ABOUT DAMAGE?
It should be ok since you pulled over right away & filled with water again. Only damage would be if you kept on driving awhile after the alarm went off.
Quick update.......We took delivery of new to us 2019 Expedition Limited Texas Edition and everything seems to be just fine. Reading through the owner's manual on page 337, I discovered that the engine has a "Fail-Safe Cooling" mode that automatically goes into effect once the engine reaches a preset temperature. It goes on to say, the engine automatically switches to alternating cylinder operation. Each disabled cylinder acts as an air pump and cools the engine. When this occurs, your vehicle still operated, however: Engine power is limited, the air conditioning system turns off. Continued operation increases the engine temperature, causing the engine to completely shut down. Your steering and braking effort increases in this situation.
When the engine temperature cools, you can re-start the engine. Have your vehicle checked as soon as possible to minimize engine damage.
Sounds like you can limp home, or to a repair shop if you lose a hose.
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