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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 05-31-2004, 04:10 PM   #1 (permalink)
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I recently changed out the thermostat on my 89 3.25ix after the temperature gauge began bouncing from the lower third to the upper third of the dial and all points in between. After the the change the the gauge stayed well within the operating range and rock solid. After about 2 months the gauge started to do the same thing all over again. I had the system flushed but no change. Is it possible to have gone through a new thermostat that quickly or is there something more to this as in the temp gauge or something else upstream. Any help would be greatly appreciated.
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Old 05-31-2004, 04:46 PM   #2 (permalink)
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The sending unit may be going bad. They cost arround $20 for a new one.
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Old 06-01-2004, 02:38 PM   #3 (permalink)
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fan clutch, water pump or both-------Steve
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Old 06-01-2004, 04:11 PM   #4 (permalink)
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if it is bounceing, it is probably the guage, mine did that, and when i would tap on the gauge console it would correct itself... untill the needle broke and fell off that is.
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Old 06-02-2004, 04:34 PM   #5 (permalink)
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Try taking off the lower bit of trim beneath the steering wheel (three plastic bolts and a clip near the foot pedals) then stick your hand up behind the instrument cluster and try wiggling the connector behind the temp gauge about.

This seems to have fixed my erratic temp readout (sometimes used to creep up to the red but a tap near the gauge would set the needle back to halfway and it would stay there).
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Old 06-02-2004, 05:20 PM   #6 (permalink)
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if the needle bounces or floats around in the gauge then tighten the nut behind it on the back side of the cluster, that usually solves the problem for most people.
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