i cant speak of the ac issue, since i have not had mine working. was broken when i bought the car. if it makes sense, this is what i did. i removed the all four hoses from the bottom of the servo. pulled the electrical and vacuum lines, there are also two on the very bottom of the servo as well. and pulled the servo out of the car. my aux pump is attached to the same bracket as the servo, so it came out as well. i then just put plastic hose connectors/pipe between the hoses and i have full heat in the car now. so hot that i have to turn it off and on, and then eventually roll down the back two windows to even it out. i know, i know....but i just havent had the time to go to part yards to pick another servo up. and i REALLY dont have the money at this time for a new or rebuilt servo.
here is a pic of your system, i think, and you can see how the water runs through the servo (regulating valve).
http://www.peachparts.com/shopforum/attachment.php?attachmentid=40174&d=1168228570