My 89 300e is experiencing a high temp (110 - 115 degree) while in traffic with AC on. By seaching the site, I found it could be a bad auxiliary fan switch, can some confirm this for me. When the car cruise 60-70 mph on the freeway, no problem at all (85-90 degree) and after driving 30 miles to work, open yhe hood, the auxiliary fan is spinning. So I am guessing the switch is bad and did not activate the auxiliary fan to a higher speed when at stop-and-go condition