[swervin ervin]

I think that when you flip the switch, if you hear the valve grind or make a noise, this tells you the switch at the dash is working. This is the way mine did and wouldn't work have the time. So, I took the simple route first and replaced the switch. Didn't help for long. I had to end up replacing the valve anyway. Buy these parts from the dealer. Especially the valve. It's not cheap, but it will work better and longer.