replace the radiator cap. I fought this for 2 days . after changing theromostats twice and bleeding air from the system, I finally changed the radiator cap and solved the problem.
The hose that goes from the overflow to the bottom of the radiator on a 2002 Windstar is the bypass hose. It allows coolant from the overflow to return to the radiator as it cools.
thermostat or blown head gasket....
Transmission fluid, if you have a bad radiator.
Could be thermostat not opening causing a back pressure
In a 2003 Ford Windstar the engine coolant reservoir is in the engine compartment ( on the passenger side , it's the reservoir in the middle )
Could be bad thermostat or plugged coolant line
Bad head gasket? Bad thermostat? Defective radiator cap?
Thermostat may not be opening
is your car equipped with a coolant overflow bottle replace thermostat have radd removed flushed and rodded
The car is overheating. Possibly the thermostat is stuck closed. Have it checked by a mechanic.
Through the overflow tank. Open the bleeder valve on the thermostat housing, turn heat to high, and pour coolant in the overflow tank until it comes out the bleeder valve.
You might have air in the coolant system from a recent part {Hose, thermostat,etc} change. It will push the fluid through the hoses where ever it can go...