I believe it is your expansion valve , it's in the evapator core & gets sticky or completely stuck & fails to work or let the freon flow thru creating a vacumn, should'nt cost but about $30. @ Oriellys Auto Parts or a similar Auto Parts Store.
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.
Check for a vacuum leak -sounds like it is starving for vacuum and reverts to the default position
If central air conditioner turns on but is not blowing through the vents, check the filter. If it is dirty, change it. Change the thermostat into cool, this will defrost the air conditioner.
If the air vents of the Chevy trailblazer 2004 are not blowing air, have the fuel pump checked.
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Vacuum leak
An air conditioner evaporator is the part of the a/c system that the heat in your car transfers to causing cool air to blow from your vents. The blower is in front of it and it sucks air from the inside of your car and across the evaporator then blows out your vents.
To prevent bugs from coming through your air conditioner vents, you can install vent covers or screens to block their entry. Regularly clean and maintain your vents to remove any debris or potential entry points for bugs. Additionally, sealing any gaps or cracks around the vents can help prevent bugs from getting inside.
Coming out of the vents around 43 degrees
It doesn't have to be if you close the vents and turn it down to a warmer temperature.
how do you fix chevy 20 ac to blow in correct vents
I'm investigating this as well. I have a 2008 and have been told the air conditioner is only off when you have the vents on the floor only. Still checking this out.