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Recently replaced water pump, and two weeks ago replaced the fan behind the grille since it stopped working.

Now every time I drive for about 10 minutes the temp gauge will pass the middle mark(6 o'clock position), and then gradually go back to the middle mark. If I continue to drive longer the temp gauge will swing back and forth between the middle mark(6 o'clock position) & the 8 o'clock 10 minutes position.

Coolant is full, no leaking, fan behind the radiator is also working.

Any clue what causes this situation, or any chance the temp gauge is not working properly?

Thanks.
 
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