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Whats the problem?
My best guess is your AC belt is in bad shape and tightens when you engage the AC/Defrost.
Probably bad brushes in the motor.
Take it to a professional who has the proper equipment and training to do the job correctly.
central AC unit - sometimes after any AC unit shuts off, you might hear the refrigerant gurgling in the lines, that is normal. window AC - older AC units had water draining out of the back end of it, this is the moisture removed from the air in the room. Newer AC units usually do not have any water draining out, the water is splashed on the hot coils in the back end, where it evaporates, which helps get rid of the heat and makes the unit operate more efficiently. it is normal.
If you have a problem in your Aircon Clutch,it is the time to visit this site http://www.automotiveforums.com/t584735.html, they can help you in your problem in your clutch,or your second option is to look for the best automotive to troubleshoot you ac,
If the squeaking sound is heard only when the ac is on, the ac pulley may need a little bit of WD-40 sprayed on it.
You probably have a loose blower wheel. Call an AC tech to fix it.
Denso
Champion Filters (not connected with Champion Spark Plugs)
the way to trouble shoot the blend door is if it stays in hot or ac mode means bad Blend door