welcome to the forums..as for your fan..it's suppose to turn fast..try taking the blade off..and try to get some wd-40 or some kind of penatrating oil into the motor..if this don't help it..you will need another fan..as for the coolant..i can't help you there..my trx350d has a oil cooler and fan..but..for yours..i wouldnt change your coolant about once a year.