I am still having a waterfall sound under my dash. Will the air escape from the system with my reservoir cap on? If not, I will follow the purge procedure with the engine cold again and purge the system with the cap off of the reservoir. I may try to switch the heater hoses if this does not work. Any suggestions?

 

No it cannot escape with the cap on, it is a closed system.
If it is a small air pocket it may, but not a big one.

 

I will try to purge with the coolant cap off then. Will squeezing the upper radiator hose assist in removing an air pocket while purging?

 

No.
Just follow the instructions in the write up section.
Squeezing the upper hose will only suck air in.

Doing it properly can take 30 mins but thats what you have to do.
Follow the instructions.

 

I never have issue, I just take off the hose cap and pour water in till its full.

 

First, stop what you are doing before you toast your engine from over heating. It is obvious that you do not know how to purge/bleed the system so send me your tele number and I'll call you.