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I have a 05 L322 and when I turn on the heat full blast (with the center dial on he 3 red dots) I still get cold air but the rear vents are blowing hot air? Any guesses? Thanks for your help!
 

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Did you check the rear controls? Rear fan dial needs to be rotated to OFF for the front controls to work the rear vents.
 

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On the centre vents, there's a small dial that goes from red-blue, put it to blue and it lets in air from outside, red takes heat from the heater core. Rear vents are not affected by this.
 

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There are five plenum doors and five electric motors controlling air circulation off your main blower in the front. Anyone of those doors can stick open or closed for a variety of reasons.

There is a separate blower for the rear under the console and another plenum door and motor.

In short, they are two distinct and separate systems for blowing air.
 
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