whats up with my hvac?

[GenVI805]

so guys i need some help. i have the dual zone climate control in my gtp and ive noticed that sometimes it blows really hard but then out of nowhere it will slow down like i turned the dial down a notch or something. it goes back and forth once in awhile and its getting annoying! any ideas???

[GenVI805]

if anyone was wondering i fixed the problem with a new cabin air filter. but now i notice my drivers side is consistently 8-10 degrees warmer than the passenger side not matter how cold the air is blowing. our mechanic had recently charged the system because a line popped but its been hot out and i noticed the difference. our mechanic said the pressure in the system is good and thinks its some door under the dash thats 500 bucks to change

[hockey101]

i have the same problem with the air temp.... the door sounds like a pain to change theres a write up on here.
http://www.grandprixforums.net/blend...ent-21941.html