sounds like pressure relief valve if replacing the valve doesn't stop the leaking you may have to much pressure in your cooling system mainly a Head Gasket leak.
Check radiator hose, leaking water pump, look for hole in radiator, leaking coolant bottle or leaking seals.
maybe your radiator is broken and you need to get a new one or just get a reparation if the radiator starts leaking when is in use it may be leaking because of the pressure of the water.
It could be the radiator, the hoses, a leaking coolant tank or the water pump.
Put water in it and if it leaks ..... its leaking. A DUUUUUHHHHHHHHH!
the lead that goes to radiator came out, when l put back in would not hold and now leaking, water pressure was low and water is funny colour (kinda red)
either your radiator is leaking,head gaskit is leaking if it's your head gaskit leaking you will have water in your oil or water coming out your exhaust pipe,or you might have a freeze plug going bad.
A thermostatic radiator valve is a valve that is connected to the hot water heating system. It can control the room temperature by regulating the amount of water that goes into the radiator. The valve is able to control this by sensing the temperature of the air.
Most likely the intake manifold gasket is leaking.
Thermostat and radiator
Several possibilities: 1. Radiator is leaking. 2. Coolant hose is leaking. 3. Hose clamp is loose. 3. Seal on water pump is leaking. 4. Overflow container is leaking. 5. Radiator clamp is loose or bad. Two highest possibilities: Radiator or hose is leaking.
ac or exhuast
It is leaking coolant or the radiator cap is faulty.