I have an aqua source shower faucet and when it is turned all the way on the water only gets warm it will not go to full hot water how can I fix this

Read this,

How To Adjust a Single Lever Shower Faucet - Self Help and More (http://www.selfhelpandmore.com/plumbing/how-to-adjust-a-single-lever-shower-faucet.php),

AND

How to Adjust an Aquasource Shower Faucet | eHow (http://www.ehow.com/how_12049137_adjust-aquasource-shower-faucet.html)

And view these videos and see if they solve your problem.

https://www.bing.com/videos/search?q=aquasource+shower+temperature+adjustment&qpvt=aquasource+shower+Temperature+adjustment&FORM=VDRE

https://www.bing.com/videos/search?q=How+to+Adjust+Aquasource+Shower&FORM=RESTAB

As you see from the videos most shower faucet have a way to adjust the temperature, be it single or double handles.

As indicated above, there is more-likely anti-scald ring installed. Remove handle and readjust the ring to give you more hot water

Milo