Greetings Allan,

If your model is fairly the same as my '80 then the aux. fan doesn't come on until the a/c button is depressed and the a/c working. Your model engine should have a clutch fan for the radiator that keeps air flowing according to ambient temps. If you are getting excessive temp reading on your gauge, let's say over 98 degrees celsius then I'd image your thermostat or dirty radiator cooling fins are the culprit. We've been getting temps in the nineties as well and mine seems to be running at about 84 degrees C or close to it.

Charles