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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 11-08-2009, 09:03 PM   #1 (permalink)
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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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Old 11-10-2009, 11:24 PM   #2 (permalink)
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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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Old 11-10-2009, 11:56 PM   #3 (permalink)
OMFG another one!?
 
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The switch resistor may have failed.
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