1,6,7,8 - Series and Mini CooperGeneral Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.
The problem is almost certainly the heater control valve. This is on the fire wall on the drivers side. It is underneath a plastic cover. It is fairly easy to replace (I replaced it on my wife's 735). The part costs about $100 +/-. Takes about an hour for a relative novice. The heater control valve has spring operated rubber diaphrams that eventually fail allowing the hot water from the engine to continously circulate through the heater.
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.