TM   10-3930-643-20 ENGINE, FUEL, EXHAUST AND COOLING TROUBLESHOOTING AND MAINTENANCE. 4-27. Radiator   Assembly.   (Sheet   3   of   4) DRAINING 7. 8. 9. 10. 11. 12. 13. 14. 15. Position   suitable   container   under oil   cooler   drain   valve   (5)   on   lower left   side   of   engine. Open   oil   cooler   drain   valve   (5)   and drain   coolant. Close   oil   cooler   drain   valve   (5). Using   a   3/8”   open   end   wrench,   remove nuts   (6   and   7)   from   thermostatic switch   (8)   on   lower   right   side   of engine. Position   suitable   container   under thermostatic   switch   (8). Using   a   7/8”   open   end   wrench,   remove thermostatic   switch   (8). Drain   coolant. Install   thermostatic   switch   (8). Using   a   3/8”   open   end   wrench, install   nuts   (7   and   6). Go  to  sheet  4 4-115