Keep in mind that I am only a "shade tree" mechanic, but I do have some experience with this very problem...Take the radiator cap off and look in the filler neck with the engine running. BE CAREFUL!!! If you see bubbles sniff around the filler neck and see if it smells like exhaust gases...like burnt gas. If this is the case, the head gasket or the head itself is the culprit. Exhaust gases will blow passed the gasket/crack in the head and pressurize the cooling system. This pressure probably found a weak spot in the heater core and that would explain the steam. There may be other explanations but this is what happened to me today. When I identified the smell of exhaust gases coming from the radiator,it was evident that the problem was with the gasket/head.
Your transmission cooling tank is leaking into the radiator.Any oil in the cooling system will dramaticlly lower the cooling capabilities of your radiator.Replace rad. and flush coolig sys with cleaner.
Because it's leaking somewhere. Other than lines in the cooling system, head and intake manifold gaskets are a possibility.
Rust from your cooling system is flowing back into the overflow tank when the motor warms up.
Cooling system needs to be flushed - rust accumulation
Keep the overflow tank filled to its FULL line. Find the highest point in the cooling system; open it very slightly. Sometimes the highest point is the radiator cap. Sometimes the highest point is at a hose clamp. Very rarely there is a bolt that is meant to be loosened to let air out of the cooling system (example 1995 Mustang) You will hear air coming out. Keep filling the overflow tank. Then re-tighten the part that you opened. Also you will want to have the car's heater on HIGHEST/HOTTEST while doing this because the heater is connected to the cooling system.
Drain and flush your entire cooling system.
You should not need to "bleed" it. The cooling system water pump circulates the coolant throughout the entire cooling system (including the cabin heater) and during the process any air in the system should migrate to the overflow tube and be exhauasted into the fluid overflow reservoir.
A little water coming from the muffler for the first few minutes after you start the car is normal. Water vapor condenses inside the exhaust system when you stop the motor, and is expelled the next time you start. If there is a lot of water coming out, and it keeps coming even after the car is thoroughly warmed up, then it could be coolant leaking into the cylinders from a bad head gasket or a cracked block. You can have a mechanic do a pressure test on your cooling system to test for this. He also can test for the presence of exhaust gasses in the cooling system.
This is coolant. You have a leak in your cooling system or you water pump has failed and is leaking.
When the fluid in the cooling system heats up, it expands, causing the pressure to build up. The cap is the only place where this pressure can escape, so the setting of the spring on the cap determines the maximum pressure in the cooling system. When the pressure reaches 15 psi, the pressure pushes the valve open, allowing coolant to escape from the cooling system. This coolant flows through the overflow tube into the bottom of the overflow tank. This arrangement keeps air out of the system. When the radiator cools back down, a vacuum is created in the cooling system that pulls open another spring loaded valve, sucking water back in from the bottom of the overflow tank to replace the water that was expelled.
It does not necessarily indicate a problem. If the cooling system was over filled while cold, the excess will have to escape from the overflow when the pressure builds. This is normal. If it continues after several periods of the engine warming up, it may mean that the cap is defective.
Not much, the excess coolant would be pushed out the overflow tube.
it has a bad head gaskit
You have a leak in the cooling system. It could be from a number of sources such as, radiator, radiator hoses, heater core, heater hoses, water pump, intake manifold gaskets, head gaskets, cracked heads and probably a few more. Have the cooling system pressure tested to determine where it is leaking from and don't wait.
leaking head gasket or improper fluid in cooling system
more time then not a leaking head gasket or a sleeve
Have you pressure tested to rule out a blown head gasket? Does the cooling system build up full pressure and start dribbling into the overflow long before the engine is hot? If so, it could be exhaust gas leaking into the cooling system.
A 1991 Subaru Impreza might overheat because of a leaking cooling system or because of a damaged thermostat. You might also have a damaged or leaking radiator or a cooling fan that is not working.
Heat from the engine causes liquid to expand. It used to overflow onto the ground if it caused enough pressure to open the radiator cap. The overflow tanks were installed to automatically catch and return the coolant to the cooling system.
Orange liquid leaking from any vehicle is usually a sign of a leaking cooling system. If the location is in the front then it is likely an issue with the radiator.
Usually if it's not serious, check the cooling system hoses.
To bleed the cooling system on a Pontiac 2.4 engine, there is a small hose near the bottom of the radiator that needs to be removed. Then remove the radiator cap and the cap on the radiator overflow tank.
The cooling system on a 2001 Mitsubishi Eclipse GT can be burped by gently squeezing the upper radiator hose. Keep topping the overflow tank until the air is purged.
This is might also be the time to check your cooling system for any possible leaks. A leaking heater core in the winter time can be dangerous, because you are exposed to the coolant fumes in a closed environment. If you suspect a leaking system, drive with fresh air coming in from your vents or a window slightly open.
If it is red or brown it is the transmission cooler (in the radiator) leaking. If it is milky white, internal engine oil leaking in to the cooling system, head gaskets.