I have an 83-280ZX non turbo. I just noticed that when I shut off the car that the cooling fan is not switching on and running like it used to. Is the fan controlled to turn on depending on the temperature or is it set to turn on no matter what based on a timer. If it supposed to come on and does not what is a common cause for this and how can it be corrected. Is there danger of damage as a result of it being driven while not operating? Seems like a lot of questions for just one thing. Anyone have any experience with auxiliary cooling fan problems??????