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Need more info, could be heater valve, could be heater switch, could be Radiator fluid low, could be Engine thermostat not working or not present so coolant is never getting hot enough to provide heat to the coil.
It is likely that the heater core has sprung a leak, or the hoses leading to the heater core have failed. This would cause a loss of coolant that would make the coolant temperature sensor think it wasn't necessary to turn the fan on, and would cause steam to appear to rise out of the back of the engine. If you turn the heater on inside the passenger compartment and get steam through the vents, it's DEFINITELY a heater core breach. Otherwise, check the hoses leading to the heater core and make sure they are still connected and not leaking. Good luck!
fit antyfreeze on radiator start engine to get hot place spot light 12 volt to thet poind and when is leak give a shot with camera on 3 positions and check on computer wat it is? head gasket,inlet manifold,or bay pass pipe good luck.
TO FIX COOLANT LEAK.YOU HAVE TO LOCATE IT.BEST TIME FIND COOLANT LEAK WAIT UNTIL MORNING.ADD COOLANT UNTIL COOLANT LEVEL IN RADIATOR CORRECT. START THE ENGINE LET IDLE UNTIL START GETTING HOT.THEN TURN OFF ENGINE.COOLANT PRESSURE WILL PUSH COOLANT OUT WHERE LEAKS ARE.CHECK TOP RADIATOR HOSE AND BOTTOM RADIATOR HOSE.CHECK AROUND RADIATOR LOOK DOWN BELOW COOLANT FAN AREA BEHIND RADIATOR.LOOK FOR LEAKS AT RADIATOR CORES AND SIDE CONTAINERS.CHECK FOR COOLANT LEAKS AROUND WATER PUMP GASKET OR WEEP HOLE.CHECK FOR COOLANT LEAKS AROUND HEATER HOSES AND HEATER CORE.CHECK ENGINE CRANKCASE FOR COOLANT LEAKS.
Looked at image and would say that that is where the hose comes off for the heater , but wouldn't know what to call it. Take the picture to the bmw dealership parts dept. they will know what it is called and order it for you. It the metal pipe broken for sure , or is the leak coming from the hose or the seal ?
sounds like headgasket , when it si done you must make sure you fill with water and no aIR BUBBLES IN SYSTEM .i did one once took me 4 hours with a hose pipe ramming water into it heater matrix first then engine .i had a garage do the gasket 1st time they did not fill with water properly and it blew had to do it myself