i dont have a scan tool. or a heat gun, i was just looking on advance auto's web site and the sensor has a 1 star rateing out of 5 and everybodys fans were not cutting on, im thinking im gonna just go all in, and get a acdelco sensor, water pump and thurmostat and do a good flush, and go green, that way i have no worrys because i drive it 390 miles a week,