Question about 2002 Chevrolet TrailBlazer
The floor usally has a vaccum servo,so check it to see if the servo is moving.Pull the ac/heater control from dash,and remove the vaccum plug.Spray some silicone(silicone spray only)in the vaccum lines(plug)and the receptical for the plug.Do this while it is on,and engine running,this will unstick the vaccum switch if it is stuck.Also before starting this,check for vaccum at this vaccum switch.If there is no vaccum,go under hood and follow the vaccum comming out of firewall,and find a vaccum reservoir,or a vaccum check valve,and check them to see if they are damaged or not connected.I hope this helps,if you need more help let me know.
Posted on Oct 05, 2009
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Posted on Jan 02, 2017
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Aug 24, 2014 | Cars & Trucks
Fig. Remove the floor air outlet duct extension (1) from the floor duct (2)
Disconnect the electrical connection at the blend door actuator (#10 in pic below).
Fig. Blend door actuator and related components
Remove the blend door actuator mounting screws from the HVAC module.
Remove the blend door actuator as an assembly with the actuator cam.
Fig. Remove the blend door actuator mounting screws from the HVAC module
Picture of actuator:
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