Question about 2004 Chevrolet TrailBlazer
Typically, you have a vacuum issue, air flow system is designed to FAIL in the defrost mode, so no vacuum, doors are spring loaded to blow out defrost ports.
Posted on Sep 25, 2009
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Posted on Jan 02, 2017
Inside the ventilation system there is gates that open and close to direct the air flow. These are operated on vacuum on most vehicles. The hose for that perticular gate may have disconnected somehow or has a hole in it. I suggest you take the heater controls out and see if there is a plug with a series of colored hoses on it. it so you'll have to trace each of them to see which one is the problem. Now you may be able to get some help from you local dealers mechanic who just may know the color code for that gate. (which would be a bonus) Good Luck
Posted on May 28, 2009
either a vacumn pipe is broken or the ends split so its not passing a vacumn to open the flaps,where they are and how to get to them i cant help because i have never worked on one as they are not here in spain.check the engine end first though .Look for some small rubber pipes running from the inlet manifold
Posted on May 30, 2009
SOURCE: 2004 Chevy Silverdo Crew Cab
if your ac is on max i believe it recirculates the air in the car by sucking air in by the defrost vents and blows it back out of the normal vents try to move the controls to make sure the that the shutters are working and make sure the ac is not on max by selecting the knob that has an arrow going through the little car instead of the circular one that might fix the problem
Posted on Jun 29, 2009
There maybe some thing wrong with the air direction door. Or the actuator that operates it. This is probably a dealer fix but check local auto A/C repair shops to see if they can do this kind of work.
Posted on Aug 12, 2009
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