I have a 2210D. I was wondering what a normal operating temp should be? My tractor generally runs around 150-155 and has never went over 160. This seems quite cool compared to what others have posted their temp ranges at. I am wondering if I have a bad temp gauge. It is a Sunpro gauge and I just installed it about 3 months ago. I made sure that the probe was completly submersed in water when I installed it, so I know that is not the problem. My coolant/water ratio is about 35%/65%. Does anyone else have this low of an operating temp?