A leak. You need to see where it is coming from.
The radiator cap could be the cause of coolant reservoir overflow or backup. Have the cap checked to see if it is bad.
Could be bad thermostat or plugged coolant line
It could be a couple of things. The coolant system could be over full. There could be a clog in the radiator. Or possibly the thermostat but not likely. also, the ford coolant tank is pressure sealed, if the cap to the tank has a defective seal, it WILL overflow when you stop your car, or whenever the pressure builds
Could be thermostat not opening causing a back pressure
It could be the coolant overflow tank that is leaking.
Transmission fluid, if you have a bad radiator.
There could be several reasons. Under normal operation, the vehicle will experience this as the coolant heats up and expands into the over flow. A bad water pump, low level of coolant, as well as a clogged radiator could also cause this problem.
/the water circulating noise could be low coolant in the system. If the coolant is bubbling in the overflow bottle, then check for a blown head gasket causing the noise.
A blown head gasket could allow coolant to enter the combustion chamber from the water jacket. The coolant probably is running out the exhaust on first start-up. More often, you will notice the coolant being pumped out of the overflow as the exhaust gas pressurizes the coolant. You should look for this symptom when the engine warms up. Coolant in the exhaust on start-up and then the coolant overpressure overflow from the expansion tank or radiator happening together is almost sure indication of the head gasket failure.
The description of the symptom could indicatev a head gasket leak allowing the pressure of the combustion chamber to intrude into the cooling system and forcing the coolant out.
That's a really good question Mine is doing that too. It's also overheating. Maybe we could collaborate for answers?
had a bad overflow tank that wouldn't hold pressure