Mine work well I just hate them go through the car wash and they bake on the soap before it can be rinsed off. Rain and road grim gets baked on. IMOP they suck.springer said:Ican shut mine off, but they dont get hot enough to clear fog let alone ice. Both sides do it so I dont know if they work or not. anyway to test it easy. The light on the dash lights comes on and the switch gives a click like a relay, but it doesnt seem to heat or it not heating enough.