I have just bought a 1996 windstar gl 128k. The first day I used it, it overheated due to low coolant level. I put in about 2 quarts (50-50 ratio). The next day (today) I drove around town all day, no problem. Tonight I take it out to a 3k destination, and hardly shows as warmed up. Parked it. Coming back 1 1/2 hours later, I noticed, just about home, a gurgling sound, similar to air in system and the heat gauge quickly climbing to the red. After parking it, thinking somehow the coolant level has dropped again, I checked the overflow container and it is up where I filled it the day before.
By the way, I slowly released the radiator cap and air bubbled into the overflow tank.
Does anyone have any ideas as to why it would heat up and make gurgling sounds when the coolant levels show normal in the overflow container?