Hi everyone...I'm having a problem with my A/C that seems to be common. The passenger side will blow cold air for a while and then starts blowing hot air. The driver side works fine though. Its probably the blend door actuator. But all I see on the forum are posts about 2005 model Silverados. I was wondering what to do about a 2008 Silverado. Re-calibrate (and how?) or replace the blend door actuator (and how, where?) Thanks for the help!!