2001 SP 5OO HO, HAD A LEAKING COOLANT RESERVORE DUE TO BROKEN ELBOW ON BOTTOM (NEVER OVERHEATED BEFORE THIS) I REPLACED THE ELBOW AND TOPPED OFF THE SYSTEM, AND NOW ITS INSANE IT OVERHEATS WITHIN 5 OR 10 MIN AT IDLE, I CHECKED FAN WITH JUMPER (WORKS) CHECKED HOT LIGHT WITH A JUMPER (WORKS) WATER IN RADIATOR IS VERY HOT SO I ASSUME THE THERMOSTAT IS OPEN, WATER LEVEL GOES UP AND DOWN WITH THROTTLE SO I ASSUME WATER PUMP IS WORKING, LOTS OF ASSUMMING NOT REALLY SURE WHAT TO DO NEXT SENSORS ARE 50 OR 80 BUCKS EA. HOT LIGHT WAS COMMING ON THE FIRST COUPLE OF TIMES BUT DOESNT NOW, NOR DOES THE FAN, AND I HAVE RE-CHECKED BOTH LIGHT AND FAN , DONT MIND BUYING A SENSOR BUT DONT WANT TO GET THE WRONG ONE.........THANKS