It should have nothing to do with the vents itself. More than likely it's the blower motor that's not working.
because of being poorly made
50-100 USD
i am having the same problem with my LTZ 02
No way of knowing without a service record and even then it would be a guess.
more than likely some of the wires are loose
No. The 2001 TrailBlazer was simply a trim package for the Blazer, which used an electronically controlled 4L60E transmission. The 1992 pickup would have a mechanical 4L60 transmission.
The flashers are located on the top of the steering wheel like they would be in a 2005 Chevy trail blazer.
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
The ac compressor is shot. Usually what your hearing is a bearing that is moving around.
The flap that directs sir to the selected vents is jammed or broken...or the switch that controls it is.
There are several vacuum hoses in a trail blazer. Any of them leaking can cause ac vacuum problems. Look under the dash to see the in the vehicle hoses. It would be a good idea to get a vacuum diagram of the vehicle and check all of the hoses.
yup