Just as a precaution you should pull the codes from the aircon, just in case it is an electrical fault with one of the door motors or something.
You can download the code reading method in a folder
http://www.subaru-svx.net/photos/user.php?How-To|14263
here. It is on a Word document.
If it does not show a code then it is probably all right electrically, and you need to see why hot water is not getting to the core.
Joe
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