I recently had the alternator changed due to the recall and have a question. Since the work was performed the coolant level does not change in the reservoir. It stays at the max level mark, hot or cold. I checked the level in the radiator and it is ok but am questioning the reservoir level. On every other vehicle I have ever had, including my '04 Altima, the coolant level in the reservoir goes up with the engine hot and goes back down when it is cold. Mine never changes from the max level mark. Feedback please on what the level does in others reservoir.