I have a Gravely 260, with a Kawasaki 27 HP water cooled engine. Ever since I have had it (not new) the temp light comes on after about 15 min of mowing. I have replaced the temp sender but still happens. There is no thermostat in it (previous owner removed it) It does not boil over. I checked the radiator with a inferred thermometer and it reads about 180 and the block shows about 240-250. Could the water pump be bad? I don't think the radiator is plugged. Any suggestions?