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aquaholic

aquaholic 1/6/2013

2002 Chevrolet Blazer LS 6 Cyl 4.3L

Body & Interior

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

2 Answers


topdogracing

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

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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