aquaholic 1/6/2013

2002 Chevrolet Blazer LS 6Cyl4.3L - Body & Interior

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heater air will not blow on the floor; comes out air cond vents or defrost only. how do I fix?

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  topdogracing 1/6/2013

  you probaly have a vacum leak under the hood or a bad vacum line the vents are vacum controlled

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  CVO 1/6/2013

  The Mode Door Actuator controls the direction of airflow. It selects which way air flows through the different ducts. If your climate control system has lost the ability to control which vents the air comes out of, the MDA has probably failed. Both the ATC and MTC systems use this device.
  
  Both failures can be seen by the climate control system's integrated diagnostics system.
  
  See this http://www.autozone.com/.../...rGuideContent.jsp

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