Overheat Warning light on

I have an 09 Arctic Cat 400 H1 TRV that has the overheat warning light coming on as soon as I start it. It is a oil cooled, carburated motor. I checked the oil and the other fluids and everything is fine. Our dealer wants $40/hr to call the Arctic cat home office because they don't know whats going on either. I was hoping some knowledgable people on here could give me some insight. Thanks in advance!