2004 Chevrolet Blazer "dash vents defrost" Questions

...dash vents no matter where the controls are set. Sounds like a vacuum motor problem which controls the blend door and its position inside the dash board area where the flapper directs air from the ...

dash vents not working I have a 2005 chev trailblazer I changed out the battery today and the dash vents are not working, the defroster, floor vents are working though I also changed the battery on my

...vents just defrost and heater vent replaced switch on dash checked fuses it is probally your control unit in default mode as defroster is needed for saftey.  your control unit might be bad but ...

...is the function of sensor on upper dash defrost grill Most of the GM trucks of later 90's and newer have a little black nub on top of the dash by the defrost vents for a daytime running lamp

no floor heat 2004 Blazer No heat from floor just the defrost and dash vents Usually a sign the blend door is not working under the dash. The blend doors direct air thru the vents and the heater core.

my heat works but it doesn't blow out of dash vents, only the floor board and defrost vents. it's a 1992 chevy blazer 4wd with 4.3 v6 A vacuum hose has come loose or broken under the hood.

defrost works dash vents work floor vent doesnt get the damper control repaired Stuck damper door or problem with vacuum actuator or linkage issue

...dash which works like a vacuum line valve to the different settings like defrost, vent or floor and at worst it's going to be the actuator vent door. But most of the time it's going to the the switch ...

...vents only. What could be causing this? either no vacuum is getting to the vent door switch or the vent door switch is bad, but I suspect the vac hose is diconnected, or cracked. under the hood the ...

...defrost or floor, it still blows out of the vent. How do I fix this? THAT HAS NOTHING TO DO WITH A HEATER CORE IF CORE IS GOING OUT IT WILL LEAK THATSOUNDS LIKE AN ACTUATOR ACTING UP OR VACCUUM LINE ...