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2004 Envoy 6cyl 2wd - No heat coming from front vents when using the manual function - If I step through the options very slowly ie: defrost/ floor,front mix/ front then it starts blowing pretty good but if i touch the temp controller "increase temp from 75 to 85 degrees" it stops blowing immediately. Sometimes I can hear the blower going like crazy with the front selected but no air coming out anywhere. The last work I did on the vehicle was replacing the Sway Bar links on the front end and I disconnected the neg battery cable to prevent inadvertant safety bag discharge. Prior to that it was working fine. Some extra info - Temp gauge is registering at about 180-190 degrees/ fluid full . Battery at approximately 14.3 jolts I am open to any suggestions . This is my first post so please forgive me If i'm in the wrong area for this topic. Thanks. Jimmy
 
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