2013 rzr 800s cooling problem

My fan has been being erratic lately. Sometimes it works perfectly fine, other times it kicks on late and will shut off before it reaches a cooler temp. 1. My fan has a different sound now like a bad bearing or mud lodged in it but does work. 2. Has coolant, not sure about an air pocket but I never messed with the system to make one. 3. Unplugged temp sensor next to thermostat and fan did not come on.
Any help is appreciated and like I said sometimes it works sometimes it doesnt

2013 rzr 800s cooling problem

My fan has been being erratic lately. Sometimes it works perfectly fine, other times it kicks on late and will shut off before it reaches a cooler temp. 1. My fan has a different sound now like a bad bearing or mud lodged in it but does work. 2. Has coolant, not sure about an air pocket but I never messed with the system to make one. 3. Unplugged temp sensor next to thermostat and fan did not come on.
Any help is appreciated and like I said sometimes it works sometimes it doesnt