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Coolant sensor a common problem (archive)

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Posted by BAB on January 04, 1999 at 20:23:55:

In Reply to: 95 540 Coolant leakage posted by Arthur on January 04, 1999 at 07:42:41:

After doing extensive research on the "check coolant level" warning light, the following are the most common causes: (note:the least common cause is actually a low coolant level)
1-When it is really cold outside, the coolant will predominantly agregate in the hosing and other areas besides the reservoir, thus causing the sensor in the bottom of the reservoir(not overflow) to erroneusly give the low level. After the car warms up and the fluid expands, there will be no more warning light.
2-Faulty sensor..very common problem. I have spent many hours on the internet regarding this problem and many people have had this problem. Solution:BMW dealer or you can replace sensor which is found at bottom of reservoir tank for approx. $30 + labor
3-Too much coolant or improper tightening of the bleed valve(found next to radiator cap..looks like big plastic screw) can also set off error light.
Good luck.

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