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2009 BMW 323i E90 N52
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I have removed the auxiliary water pump because it died. I am currently running without it at the moment. Would the lack of this in the system cause havoc with my flap motors in the heater. I refer to any earlier post of mine regarding problems with the aircon and heater giving odd results etc. Just need to know what issues this might cause me.
 

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No, it's only job is to push coolant into the heater core. Has nothing to do with the flaps. I have mine bypassed and have no issues, actually even the heat works just as good as before. I figure the pump was dead when I bought the car and I didn't notice and didn't have an issue till it started leaking.
 

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Yesterday i my 1997 bmw 540i ran out of coolant. i checked the car and i realized that was a leak at the bottom of the auxiliary water pump(i think). i believe it might be a seal or something like that. i took off the aux water pump and the heater valve. Is this a common problem with the bmw's??? how can i fix it??
 

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It's probably safe to say it isn't a thread jack I suppose. As for your pump Arien, if it's leaking I think you're gonna end up replacing it. Pretty much all plastic as you can see, and there's no "stop leak" for that. I desperately tried a few things for mine, ordered new one just recently. If you can call it good news, I believe I found the best deal available when I bought mine. I'll link below, but you can bypass it for about $5 with a "T" or Y-fitting from auto parts store. Note, you will have full heat flow through cores with the y-fitting.

This link is for the valve assembly without pump
http://www.ebsracing.com/catalog-1/itemdetail/bosch/653-06022-101
 

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The aux pump had been bypassed when we bought the 525i in 2009.
There has not been any problems.
The heater works fine***8230;.but we are in California***8230;I am not sure if I would
be saying this if I lived in the Adirondack mountains of New York again, where
I had to have a small electric heater plugged in to the engine over night
in order to insure that it started in the morning.

Heat convection in the coolant system will circulate the hot coolant through
the heater coils in the cabin.
 
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