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I've had a nightmare with the cooling system for my 2000 740il (114K) as well.
Can anyone tell me what the problem might be.
I had the valley pan replaced because it was leaking. A few days after while driving along normally the upper radiator hose pops off where it connects to go to the thermostat.
I asked on the forum and I was told it was probably air in the cooling system and I should bleed. Unfortunately when I went to bleed it it seem the alternator got damaged from coolant getting on it. Replaced that and rebled the system. Car ran for almost two weeks no problem. I continued to check and bleed system in the first week letting air escape through the release screw near the expansion tank.
Well yesterday my wife left work and called to tell me steam was coming from under the hood, she said it wasn't overheating. I immediately told her to pull off the road I think that hose popped off again. When I went down to check it had.
I put it back on, put in some coolant, bleed the system (with heater on full blast) as much as I could on the road. Drove it home gingerly. The temperature gauge also went all the way red. Hose popped off a couple more times and repeated the procedure each time. When the hose would pop off though the temperature gauge dropped back almost to normal.
I'm wishing for the best but expecting the worst that the overheating may have resulted in other damage such as warped heads or failed gasket.
What I need to know is what is causing this pressure thats causing the upper hose to pop off?
Is it a clog in the radiator, stuck thermostat, water pump?
Which direction does the coolant flow in the upper hose? Out the radiator to the thermostat or from the pump through the thermostat through the hose and then to the radiator with a split to the water cooled alternator?
I need to fix this car right and complete and sell it fast, not because of this problem but I need a minivan. $10K
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