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Q:

I turn on the heater but cannot get any heat. on 2004 BMW 330Ci

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No heat is coming from the system. Tried all controls
(2) Answers
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could be as simple as low coolant level. this system uses
an electrically controller heater valve which may have failed. or it may have a problem in the controller. after
trying the basics, you should find a good local BMW shop
that can diagnose this.