Kenmore washer overflowing

We are having problems with our Kenmore top loader
overflowing during the fill operation. I have reviewed
MANY posts on this topic but am still completely confused.

We have done the following:
Tested pressure switch with ohm meter. OK
Blown into pressure switch during fill. Water shuts off.
Blown into hose through the air dome. Air appears to flow into tub.
Tried to clean air dome with compressed air.

As I say, I’m completely confused at this point and am not sure
what to try next?

You didn’t supply a model number, so I don’t know which model you have.

It sounds like you are on the right track. The pressure dome may have debris in it or the opening to it. You might have to pull the agitator and clothes basket/drum, so you can clean it up.

Thanks for taking a look at this.
My model number is 110.26842690, if that helps.

You might have to pull the agitator and clothes basket/drum, so you can clean it up.
If I do that, will I get complete access to the inside of the air dome? (I haven’t been
able to find an exploded diagram of this washer.)

Part 10 is the basket. It has a nut that takes a special tool. You might be able to reach the pressure dome by just removing the top of the tub.