PLEASE NOTE: THIS IS NOT AN OEM PART...IT IS AN AFTERMARKET Radiator Temperature Sensor Switch that we found FITS into a JOHN DEERE's Gator radiator PERFECTLY. 

We used it to replace John Deere's OEM Part number of VG11759 but at a fraction of the cost.  I have personally installed one of these in our neighbor's 850D Gator about 3 years ago. It has since been used on his farm almost everyday and the radiator fan comes on and off and we have had NO ISSUES AT ALL.  Why pay more when you don't have to????  

100% money back guarantee if it doesn't fit.

Switch closes (turns fan on) at 102 to 108 degrees Celsius (approx. 215 F to 226 F)
Switch opens (turns off fan) at 97 to 103 degrees Celsius ( approx. 206 F to 217 F)
   
This same part fits should fit all the following John Deere models and it may fit others, as well:

A1 Military Gator 6X4, A2 Military Gator 4X4, A3 Military Gator 4X4, A3-T Military Gator, Gator 4X2 Gas, Gator 4X2 Homologated, 4x2/4x4 Gator HPX Utility Vehicle (Diesel), Gator 6X4 Diesel, Gator 6X4 Gas, Gator 6X4 Homologated, Gator HPX 4X2 Diesel, Gator HPX 4x4 Diesel, Gator HPX815E Diesel, Gator TH 6X4 Diesel, Gator Worksite Virginia, Gator XUV850D Diesel, Gator XUV855D Diesel, Gator XUV855D S4 Diesel, Gator XUV855E, X2 Gator (Gas, Homologated), Gator XUV855M, Gator XUV855M S4, Gator XUV865E, Gator XUV865M, Gator XUV865R, Military Gator 6X4. A3-T M Gator, M-Gator (A1, A2, A3), Worksite Gator and possible more.