Quote:
Originally Posted by PaleMelanesian
In my experience with this generation of Civic, the radiator fan comes on at 206F. If you're cycling between 205 (or 6) and 195, that's your fan cooling things down. Open up a bit of lower grille to keep it below that mark more of the time. I used to fully open my lower grille every summer.
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PaleMelanesian, thanks for that update. The temperature sensor turns on the relay at 185 degrees, and I presume the PCM controls the fan after that; 195 to 205 would be good. My last trip the temperature stayed between 185 and 198, except for the major climbs, with a 70% grill block.