If it's the RADIATOR that's steaming it probably means that you have a leaky radiator. If the cap is steaming it might just mean that you need to replace the radiator cap, but it could mean that the engine is overheating. Check the coolant level and make certain that you do not see evidence of leakage anywhere around the engine or radiator. After the engine has cooled, look for light green powder around the edges of the radiator and around the water pump. This is evidence of leakage.
It is probley just the engine coolant burning that ran into the exhaust and muffler. Just let it run awhile and burn it out. If it don't stop steaming after about 30 mins. Then you have done something wrong when putting it back together. Are you changed the wrong head. Start the engine with the radiator cap left off and keep watching in the rad while the engine is running, there should be no bubbling coming from the radiator. If there is then you still have a bad head are head gasket. Radiator should build NO pressure in it while the engine is running.
If the question is: why does your top radiator hose get soft while the engine is running? If that's what u want to know, it's because the thermostat in the engine opens to flow the coolant thru the motor to keep the operating temperature from getting to hot. It's stores water in the radiator which cools the water and the thermostat blocks it until a predetermined temp.
The radiator fan is designed to run continuously while the engine is running so that the temperature of the coolant can be lowered. The coolant is continuously run through the engine, collecting engine heat and dispersing it over the radiator fins; while the fan blows the fins and cooling off the coolant before recirculating back through the engine in a continuous cycle.
This could be due to a bad temperature sensor, radiator cooling fan relay, or possibly even the radiator fan itself. Try tapping on the radiator fan to see if it starts to move while the vehicle is at normal operating temperature. If nothing then find temp sensor and unplug and jumper the electric connection with a paper clip to see if fan starts. If fan starts then replace the temp sensor. If fan does not start then suspect either bad fuse or bad relay.
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