Hi, I notice this couple days that my auxilary fan is running all the time on my 88 560 sel. And I also notice my AC compressor doesn't engage (run) when the fan is running. However if I pull the plug connecting to the auxilary fan switch on top of the thermostat housing the fan would stop and compressor would engage. I am wondering should I change the auxilary fan switch or something further up stream thanks.

Rick