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The BMW Range
5 Series
E39
Water temperature fluctuation
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<blockquote data-quote="jarance" data-source="post: 407232" data-attributes="member: 21"><p>pls do a search on "temperature" in the E39 thread.</p><p></p><p>Sometime airlock in the cooling system will cause the temperature fluctuation. If you have not have this problem prior to the changing of the expansion tank, then it is most likely air trap in the cooling system.</p><p></p><p>However, if you have this problem before you change the expansion tank, then your problem could be due to the aux fan or the fan clutch. Another possibility that you could ask your mechanic to check is the thermostat, water temperature sensor and the water pump. </p><p></p><p>Just be careful with the temperature. When it exceed more than 3/4, your engine might overheat.</p></blockquote><p></p>
[QUOTE="jarance, post: 407232, member: 21"] pls do a search on "temperature" in the E39 thread. Sometime airlock in the cooling system will cause the temperature fluctuation. If you have not have this problem prior to the changing of the expansion tank, then it is most likely air trap in the cooling system. However, if you have this problem before you change the expansion tank, then your problem could be due to the aux fan or the fan clutch. Another possibility that you could ask your mechanic to check is the thermostat, water temperature sensor and the water pump. Just be careful with the temperature. When it exceed more than 3/4, your engine might overheat. [/QUOTE]
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