Question about 2004 BMW 5 Series

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Aircondioniong not working, no fan or cold air

No cold air. the controls are working fine and we can set the temp, but no fan or cold air.

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Hi, this sounds like the heater resistor has failed and will require replacing, if the only thing that is not working is the blower motor this would normally be the cause, regards mark.

Posted on Apr 23, 2009

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My heater fan turns on before the car has warmed up. It blows cold air? Any ideas why?


After warmup it still blows cold, or only when cold? Normally the fan will operate independently of engine temp except in some climate controlled vehicles. As long as it blows warm air after engine is at temp that's a good thing. the heater uses hot water from the engine. Obviously the heater can't be warm before the engine is. If it's cold after the engine is hot, there are vacuum controlled "motors" on top of the heater box under the dash that move doors that control heat. Either one of the control motors or one of the doors have stuck or failed. Many also have a control valve on one of the heater hoses under the hood as well. If the engine comes up to temp then the thermostat is good (should be at about 210f) Only remaining item is the core itself which may be internally or externally obstructed.
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