Question about 2001 BMW 330

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Defrost control - only Hot air

When I turn on defrost it is “hot” air – works fine but it gets pretty hot - Is there any temp control with defrost?

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If you have the owners manual, look it up in the manual...if not, do you prefer to be basted?..lol

All heaters have controls, you just gotta find it

Thanks for using fixya.com

Posted on Jan 07, 2009

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Great question dustin but the A/C is suppose to come on in defrost or mix mode- this is floor & defrost. Does not seem to make sense does it. One of the things the a/c does is remove the moisture from the air. You need warm DRY air to remove the moisture from the windows. An automotive H.V.A.C. ( Heating,Ventilation,Air conditioning) first forces air thru the a/c evaporator core then thru the heater core and out the selected vent. If you only want a/c a blend door will by-pass the heater core which is controlled by a hot/cold knob or digital temp cotrol on the dash. Now back to the cold air problem- assuming the basics are all ok- Coolant is full, Engine gets up to proper operating temp-around 195 degrees- upper radiator should be hot. Both heater hoses should be hot. If thats all OK the blend door might not be working. It is controlled by an electric motor called a Blend Door Actuator which are prone to fail. I have replaced many on ford vehicles. Hope this helps

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Hot air blows when system turned to heat, when control is moved to Defraost or combination heat/defrost air temp cools down, what could cause this?


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If its the radiator... you will notice your car will start to over heat.
It could be even more serious..like the block might be cracked.
If you see like a steam that looks like smoke coming from the tail pipe then its the block.
Again can be fixed for about 12 to 13 hundred bucks.
Hears hoping im wrong on all accounts.
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1 Answer

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Problem: Ford Windstar SE, 3.8L V6, 1999, front seat heat/defrost is alway cold with engine warm and heater turned on. Symptoms: 1) When (engine is warm and) front seat heat temp slider is moved from...


I would think the door you hear flapping is the door that controls the airflow across the heater coil - and the fan keeps blowing the door closed, preventing the airflow from going across the heating coil. I don't know whether this vehicle is vacum controlled or cable controlled - so either it's a disconnected cable, or a leaking vacum line.

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