The battery died and I changed it out now there is a clicking noise coming from the rear of my trailblazer (the sound is coming from behind the third row seats on passenger side
SOURCE: Air Conditioner blows hot on one side after battery DC
You need to replace the driver side temperature door control actuator. While doing this... make sure you bolt the new one in AND THEN PLUG IT IN or it will spin and not line up in the right place... then there is a series of crazy steps to fix that problem.
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