Hello i'm new to the forum, glad to find it!
My Edge has 66,000 miles on it and i noticed steam coming from under the hood and the overflow cap was leaking. I changed out that cap and the system was about 3/4 gallon low on coolant. I filled the overflow to level and started it and let it get warm. Temp gauge goes all of the way to hot but no coolant leaks. I checked the oil and is normal and no white smoke coming out of exhaust? I was thinking perhaps the issue is a stuck thermostat? What do you guys think? Thanks in advance for any help!