My EC light had been on for months and my air hasn't worked. I finally took it to a local shop and they told me the light stays on if your freon is low. So, they filled it up and now my AC works. But when I get in the car to turn it on, the EC light stays on and won't come off. As soon as I turn the car off and restart it, I am able to then turn the EC off? Why is that? This happens every single time and it's driving me crazy!!!

Thanks