My maytag performa keeps filling with water?

I own a Maytag Performa Top Load washer and it's about 5 years old.
My washer doesn't seem to know when it is full so I did some research on this model and found that this could be due to either the water level switch being bad, the air tube could be blocked or obstructed somehow or it could be loose. It also won't agitate-the only thing it still does is spin out.
My question-where is this water level switch and tube located? Do I just take the control panel off and lookin there?
The water level knob is located on the far left of the control panel so I"m thinking it would be behind there nearby?
I love this washer. It does an excellent job of washing my clothes and I ask a lot of my washers. Family of 6 and I do at least 20 loads of laundry a week in this washer. CLothes come out clean and spun well dry.
Thanks in advance for your help!
chris in Indiana