Quote:
Originally Posted by mwh2009
Low coolant warning. Took it in to top it off. Took a quart! Seems like a lot. Discovered the 2 sort-of-separate reservoirs. Not sure if they're completely separate or not?
The dude at the BMW service said that if you drain the big one, the little one will empty too, which i thought was either strange/wrong - why have two filler caps if they connect somewhere?
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2 reservoirs
Larger one is for engine cooling system.
2nd smaller one is for water to air charge cooler integrated into intake manifold