Phantom Coolant Loss - 2006 550i
#11
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Join Date: Nov 2013
Location: St Louis
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My Ride: 2006 550i
strange. I also am having strange issues with mine. I love the car but its been in the shop for more time than I have had it over the 6 weeks of ownership. They are amazing but do not seem to be stress free...
#12
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Join Date: Mar 2012
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My Ride: 2006 BMW 530I
Model Year: 530i
I think the leak on the vent hose can only occur when the car is off and not circulating coolant through out the coolant system. Therefore, it might be difficult to detect while the engine is running because the coolant can flow to other hoses other than the "vent hose".
#13
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Whether the pipe leaks during operation depends upon whether you have the coolant topped up all the way to the max line and what temperature the engine gets to during running.
I had read of the many failures of this part so before reinstalling the metal shield that covers the radiator, fan and vent pipe I started the engine and let it reach full operating temperature.
When at operating temperature the vent pipe started to drip slowly through a hairline crack. After I turned off the engine the drip accelerated, consistent with coolant overflowing the radiator and moving to the reservoir.
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