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2009 chevy
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:iagree: I have the same Problem after 10 - 15 minutes of driving mine starts to get heat back there and after 30 - 45 minutes you can cook the people in the back seats out.
Is this really a problem, or normal operation :undecided
The front HVAC sits on top (figuratively) of the motor, the rear has a lot of plumbing (passing through a lot of cold air under the truck) before getting the rear unit hot.
 
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