I sold my M104-powered 300E several months ago, but while I had it, I was sitting in the drivethrough at Walgreens one night, waiting forever for a prescription to be filled, watching the temp guage do the same thing yours does...it would creep higher than I would like, then the fan would kick on, drop the temp, and the cycle continued. The odd thing was, it wasn't hot that evening, perhaps in the 50's.

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2002 Ford ZX2
2 x 2013 Honda Civics