ALSO...Are these aux fans set up to run after the car is shut off to bring down the motor temp on hot days... like 80 deg., long trip, a/c was on etc...??
If so mine at high speed fan engagement shuts off with key, and I thought it should run for a few minutes. If you go to shortly re-start the temp guage can be sometimes up to 115ish before restarted and the fan gets going again.