I have a 04 Trailblazer LT EXT. When I turn the A/C on I have HOT air on the drivers side Dash vents and on floor. The Defroster is also always Hot:hopeless. The Passanger side is cool along with all 4 of the back vent. How do I get rid of the heat wave:sadcry:? Any help would be greatly Appreiated.