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1,6,7,8 - Series and Mini Cooper General 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.

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Old 10-28-2005, 12:37 AM   #1 (permalink)
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Z3 Heater not working properly

The heater in my 98 Z3 doesn't want to work properly. When I turn it on in the morning to warm up, why the engine warms too, it blows nothing but cold air. The when the car is in motion, hot air begans to come out.

Ok, now here is the kicker, cause I know what you're thinking. When I stop at a red light and the car sits idle, no longer moving but the engine's running (and the car is still in drive) the car once again begins to blow out cold air. And by now the engine is plenty warmed up. used:

My question here is, is this an easy and inexpensive fix or am I looking at a serious problem. And if anyone knows what the problem is, feel free to diagnose it too.
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Old 10-28-2005, 03:56 PM   #2 (permalink)
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I'd guess a couple things to look at:
a) is the controller fully opening the butterfly controlling hot water flow to the heater.
b) is air trapped in the heater core, allowing only partial flow
c) warm air at higher rpm's would be consistent with either a or b

Feel the hose feeding the inlet to the heater core. Is it warm/hot?
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