Could be several things. Visit our enthusiasts forum and ask us and give us a few more details.
www.trailvoy.com
The air of your Chevy trailblazer 2004 blow out of the front vents when the air conditioner is on because the air condition is faulty and it needs repair.
diagram for 1999 chev subarban air conditioner
Could be the mode door actuator. For more info visit our enthusiasts forum at www.trailvoy.com
An air conditioner blows out heat
no but it may depend on the conditioner
Portable air conditioner will not blow cold air. What to do?
If the air vents of the Chevy trailblazer 2004 are not blowing air, have the fuel pump checked.
Blower circuit board is shot
Not likely
It's out of freon or refrigerant.
about 5 minutes
Max