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O/T BMW E39 Temp gauge


neil.cavanagh

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The temp gauge on my 1998 540i has started behaving slightly strangely.

 

From a cold start it behaves normally for about the first 5 minutes, but after that the gauge goes full scale deflection into the red zone.

 

Now, the car doesn't beep at me that is overheating, which makes me think it is the gauge rather than the sender.

 

Then after another 3-5 mins of driving the gauge suddenly returns to reading correctly (by this time the engine is warmed up to normal running temp.) The needle moves less in a rapid, but damped motiong. ie takes 2-3 sec to go from full right deflection to middle of the range.

 

To me there could be 3 things wrong:

 

1) dodgey temp sender

2) dodgey temp gauge

3) sticking thermostat.

 

any thoughts? The third one could be doing some harm to the engine....

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