What exactly is "Sensor Blower" in HVAC system? - Bimmerfest - BMW Forums



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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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Old Yesterday, 02:42 PM
PancakeBimmer PancakeBimmer is offline
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What exactly is "Sensor Blower" in HVAC system?

For the love of all holy I can't find out what "Blower sensor" is. I read codes from HVAC/IHKA using BMW Scanner and only error it came back with is 'Blower Sensor" open circuit.

For the record, it is not FSU. This was my first guess too. Blower worked fine with resistor that was in the car, although jackass that installed it used only one screw to keep it place. I then replaced FSU with fairly new FSU from my car. The same error is still there, and my car never had this error with this FSU.

So any ideas what else "Blower sensor" might be within HVAC/IHKA system?

Edit: Ohh and I also tried swapping out black box air quality sensor on fan shroud.
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Last edited by PancakeBimmer; Yesterday at 02:43 PM.
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Old Yesterday, 09:03 PM
scottjoh scottjoh is offline
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Mein Auto: 1999 323i
What exactly is "Sensor Blower" in HVAC system?

Sensor blower is in the HVAC control unit in the dash. There are little slots for air to be sucked in through for the cabin temp sensor. There is a small blower in there to move the cabin air in and across the sensor.
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