Heater/AC Fan Only Works on Speed 4 - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 11-08-2009, 09:03 PM
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Heater/AC Fan Only Works on Speed 4

The car in question is a 1991 318is. The fan for the heater and air conditioning only works on speed setting 4. Based on my reading in this forum, the problem is usually caused by a faulty blower motor resistor. However, the measured resistances are in line with the specs (0.4, 0.9, 1.7 ohms).

I am looking for insight into how to proceed. Do I look at the center console switch? Or, is there a connection between the blower motor and resistor which might be faulty and is bypassed when speed setting 4 is used?

Thanks in advance for your input!
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#2 (permalink) Old 11-10-2009, 11:24 PM
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are you measuring across the coils or on the tabs?

there is a safety switch that opens when the resistors overheat.
it probably needs to be cleaned with a little sand paper.
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#3 (permalink) Old 11-10-2009, 11:56 PM
OMFG another one!?
 
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The switch resistor may have failed.

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