Coolant Warning light going on and off

blanket

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#1
I have noticed that the Coolant Warning light on the dash comes on every now and then when the heater is on. THen goes off a couple of seconds after the heater is turned off.

Coolant level is fine. This happen to anyone else?
 
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#2
It may just be a dirty, sludged-up sensor. Not sure why the heater on/off would have an effect. But the sensor, located in the bottom of the coolant fill tank, is a known failure item on older E36s.
 


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