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I will check the wiper alignment and get the test strips. Since it was back at the dealer twice for the same concerns one would think both would have been done. My biggest fear is that the coolant loss is internal. They claim there are no external leaks but it has to be going somewhere. The first time the ticket said "very slightly low due to evaporation". Huh?? It was down enough to set off the low coolant light. The light wouldn't stay on long so I kept regular checks on the level and over the course of a couple weeks the light would stay on longer and the level continued to drop. The coolant level sensor was replaced this last time but the only explanation is that the sensor failed. I suspect replacement was done because the service writer wrote the ticket to sound like the light had come on again and the level was up. I just wanted them to double check for leaks and mentioned the light coming on from the previous visit.