We have a 2011 Nissan Sentra that has a blower or short issue. When we start the car sometimes it works and the blower turns on sometimes it does not. When it does not work smacking the dashboard a few times will generally get it started. It has been getting progressively worse over the last year and does not startup all the time now when we hit the Dashboard. I just changed the Dials hoping it was the dials but it is not and still has the same issue.

I feel like there is a short somewhere. Where and how should I start looking for this short?

Anyone who has similar issues with their nissans that can help track down an electrical issue would be amazing? s